157265981 has 2 divisors, whose sum is σ = 157265982. Its totient is φ = 157265980.

The previous prime is 157265939. The next prime is 157266041. The reversal of 157265981 is 189562751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115132900 + 42133081 = 10730^2 + 6491^2 .

It is a cyclic number.

It is not a de Polignac number, because 157265981 - 2⁶ = 157265917 is a prime.

It is a super-2 number, since 2×157265981² = 49465177559784722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157261981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78632990 + 78632991.

It is an arithmetic number, because the mean of its divisors is an integer number (78632991).

Almost surely, 2^157265981 is an apocalyptic number.

It is an amenable number.

157265981 is a deficient number, since it is larger than the sum of its proper divisors (1).

157265981 is an equidigital number, since it uses as much as digits as its factorization.

157265981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 44.

The square root of 157265981 is about 12540.5733919945. The cubic root of 157265981 is about 539.7735458798.

The spelling of 157265981 in words is "one hundred fifty-seven million, two hundred sixty-five thousand, nine hundred eighty-one".