157162561 has 2 divisors, whose sum is σ = 157162562. Its totient is φ = 157162560.

The previous prime is 157162559. The next prime is 157162567. The reversal of 157162561 is 165261751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147768336 + 9394225 = 12156^2 + 3065^2 .

It is a cyclic number.

It is not a de Polignac number, because 157162561 - 2¹ = 157162559 is a prime.

Together with 157162559, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (157162567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78581280 + 78581281.

It is an arithmetic number, because the mean of its divisors is an integer number (78581281).

Almost surely, 2^157162561 is an apocalyptic number.

It is an amenable number.

157162561 is a deficient number, since it is larger than the sum of its proper divisors (1).

157162561 is an equidigital number, since it uses as much as digits as its factorization.

157162561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 157162561 is about 12536.4492979472. The cubic root of 157162561 is about 539.6551994094.

The spelling of 157162561 in words is "one hundred fifty-seven million, one hundred sixty-two thousand, five hundred sixty-one".