157712257 has 2 divisors, whose sum is σ = 157712258. Its totient is φ = 157712256.

The previous prime is 157712227. The next prime is 157712263. The reversal of 157712257 is 752217751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 127780416 + 29931841 = 11304^2 + 5471^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157712257 is a prime.

It is not a weakly prime, because it can be changed into another prime (157712227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78856128 + 78856129.

It is an arithmetic number, because the mean of its divisors is an integer number (78856129).

Almost surely, 2^157712257 is an apocalyptic number.

It is an amenable number.

157712257 is a deficient number, since it is larger than the sum of its proper divisors (1).

157712257 is an equidigital number, since it uses as much as digits as its factorization.

157712257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34300, while the sum is 37.

The square root of 157712257 is about 12558.3540720908. The cubic root of 157712257 is about 540.2836381427.

The spelling of 157712257 in words is "one hundred fifty-seven million, seven hundred twelve thousand, two hundred fifty-seven".