155970981 has 32 divisors (see below), whose sum is σ = 253824000. Its totient is φ = 94217904.

The previous prime is 155970977. The next prime is 155971001. The reversal of 155970981 is 189079551.

155970981 is a `hidden beast` number, since 1 + 559 + 7 + 0 + 98 + 1 = 666.

It is not a de Polignac number, because 155970981 - 2² = 155970977 is a prime.

It is a super-2 number, since 2×155970981² = 48653893828204722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155970911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5190 + ... + 18408.

It is an arithmetic number, because the mean of its divisors is an integer number (7932000).

Almost surely, 2^155970981 is an apocalyptic number.

It is an amenable number.

155970981 is a deficient number, since it is larger than the sum of its proper divisors (97853019).

155970981 is a wasteful number, since it uses less digits than its factorization.

155970981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13270 (or 13264 counting only the distinct ones).

The product of its (nonzero) digits is 113400, while the sum is 45.

The square root of 155970981 is about 12488.8342530438. The cubic root of 155970981 is about 538.2878797698.

The spelling of 155970981 in words is "one hundred fifty-five million, nine hundred seventy thousand, nine hundred eighty-one".