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122981 = 235347
BaseRepresentation
bin11110000001100101
320020200212
4132001211
512413411
62345205
71021355
oct360145
9206625
10122981
1184441
125b205
1343c91
1432b65
152668b
hex1e065

122981 has 4 divisors (see below), whose sum is σ = 128352. Its totient is φ = 117612.

The previous prime is 122971. The next prime is 123001. The reversal of 122981 is 189221.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-122981 is a prime.

It is a super-2 number, since 2×1229812 = 30248652722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 5347 = 122981 / (1 + 2 + 2 + 9 + 8 + 1).

It is a Duffinian number.

It is a Curzon number.

It is a plaindrome in base 15.

It is a nialpdrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122921) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2651 + ... + 2696.

It is an arithmetic number, because the mean of its divisors is an integer number (32088).

2122981 is an apocalyptic number.

It is an amenable number.

122981 is a deficient number, since it is larger than the sum of its proper divisors (5371).

122981 is an equidigital number, since it uses as much as digits as its factorization.

122981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5370.

The product of its digits is 288, while the sum is 23.

The square root of 122981 is about 350.6864696563. The cubic root of 122981 is about 49.7293374798.

The spelling of 122981 in words is "one hundred twenty-two thousand, nine hundred eighty-one".

Divisors: 1 23 5347 122981