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8101381 = 8397607
BaseRepresentation
bin11110111001111000000101
3120020121000011
4132321320011
54033221011
6445350221
7125601121
oct36717005
916217004
108101381
114633762
122868371
1318a8622
14110c581
15aa0621
hex7b9e05

8101381 has 4 divisors (see below), whose sum is σ = 8199072. Its totient is φ = 8003692.

The previous prime is 8101369. The next prime is 8101393. The reversal of 8101381 is 1831018.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (8101369) and next prime (8101393).

It is a cyclic number.

It is not a de Polignac number, because 8101381 - 27 = 8101253 is a prime.

It is a super-2 number, since 2×81013812 = 131264748214322, which contains 22 as substring.

8101381 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8101351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48721 + ... + 48886.

It is an arithmetic number, because the mean of its divisors is an integer number (2049768).

Almost surely, 28101381 is an apocalyptic number.

It is an amenable number.

8101381 is a deficient number, since it is larger than the sum of its proper divisors (97691).

8101381 is an equidigital number, since it uses as much as digits as its factorization.

8101381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97690.

The product of its (nonzero) digits is 192, while the sum is 22.

The square root of 8101381 is about 2846.2925007806. The cubic root of 8101381 is about 200.8412977946.

Adding to 8101381 its reverse (1831018), we get a palindrome (9932399).

The spelling of 8101381 in words is "eight million, one hundred one thousand, three hundred eighty-one".

Divisors: 1 83 97607 8101381