155907457 has 2 divisors, whose sum is σ = 155907458. Its totient is φ = 155907456.

The previous prime is 155907443. The next prime is 155907469. The reversal of 155907457 is 754709551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139334416 + 16573041 = 11804^2 + 4071^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155907457 is a prime.

It is not a weakly prime, because it can be changed into another prime (155907497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77953728 + 77953729.

It is an arithmetic number, because the mean of its divisors is an integer number (77953729).

Almost surely, 2^155907457 is an apocalyptic number.

It is an amenable number.

155907457 is a deficient number, since it is larger than the sum of its proper divisors (1).

155907457 is an equidigital number, since it uses as much as digits as its factorization.

155907457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 220500, while the sum is 43.

The square root of 155907457 is about 12486.2907622720. The cubic root of 155907457 is about 538.2147917242.

The spelling of 155907457 in words is "one hundred fifty-five million, nine hundred seven thousand, four hundred fifty-seven".