157505917 has 2 divisors, whose sum is σ = 157505918. Its totient is φ = 157505916.

The previous prime is 157505911. The next prime is 157505939. The reversal of 157505917 is 719505751.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147355321 + 10150596 = 12139^2 + 3186^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-157505917 is a prime.

It is a super-2 number, since 2×157505917² = 49616227780021778, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 157505917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (157505911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78752958 + 78752959.

It is an arithmetic number, because the mean of its divisors is an integer number (78752959).

Almost surely, 2^157505917 is an apocalyptic number.

It is an amenable number.

157505917 is a deficient number, since it is larger than the sum of its proper divisors (1).

157505917 is an equidigital number, since it uses as much as digits as its factorization.

157505917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55125, while the sum is 40.

The square root of 157505917 is about 12550.1361347198. The cubic root of 157505917 is about 540.0479118440.

The spelling of 157505917 in words is "one hundred fifty-seven million, five hundred five thousand, nine hundred seventeen".