157370981 has 4 divisors (see below), whose sum is σ = 157501932. Its totient is φ = 157240032.

The previous prime is 157370903. The next prime is 157371001. The reversal of 157370981 is 189073751.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44289025 + 113081956 = 6655^2 + 10634^2 .

It is a cyclic number.

It is not a de Polignac number, because 157370981 - 2¹⁰ = 157369957 is a prime.

It is a super-2 number, since 2×157370981² = 49531251321804722, 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 (157370281) 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, 63656 + ... + 66081.

It is an arithmetic number, because the mean of its divisors is an integer number (39375483).

Almost surely, 2^157370981 is an apocalyptic number.

It is an amenable number.

157370981 is a deficient number, since it is larger than the sum of its proper divisors (130951).

157370981 is a wasteful number, since it uses less digits than its factorization.

157370981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130950.

The product of its (nonzero) digits is 52920, while the sum is 41.

The square root of 157370981 is about 12544.7591049011. The cubic root of 157370981 is about 539.8936473223.

The spelling of 157370981 in words is "one hundred fifty-seven million, three hundred seventy thousand, nine hundred eighty-one".