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381253831 = 754464833
BaseRepresentation
bin10110101110010…
…111100011000111
3222120101200221021
4112232113203013
51240100110311
6101455332011
712306414130
oct2656274307
9876350837
10381253831
11186231712
12a7821007
1360ca9aaa
14388c4c87
152370e171
hex16b978c7

381253831 has 4 divisors (see below), whose sum is σ = 435718672. Its totient is φ = 326788992.

The previous prime is 381253799. The next prime is 381253837. The reversal of 381253831 is 138352183.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138352183 = 563245741.

It is a cyclic number.

It is not a de Polignac number, because 381253831 - 25 = 381253799 is a prime.

It is a super-2 number, since 2×3812538312 = 290708967304353122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (381253837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27232410 + ... + 27232423.

It is an arithmetic number, because the mean of its divisors is an integer number (108929668).

Almost surely, 2381253831 is an apocalyptic number.

381253831 is a deficient number, since it is larger than the sum of its proper divisors (54464841).

381253831 is an equidigital number, since it uses as much as digits as its factorization.

381253831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54464840.

The product of its digits is 17280, while the sum is 34.

The square root of 381253831 is about 19525.7222913776. The cubic root of 381253831 is about 725.1114095932. Note that the first 3 decimals are identical.

The spelling of 381253831 in words is "three hundred eighty-one million, two hundred fifty-three thousand, eight hundred thirty-one".

Divisors: 1 7 54464833 381253831