257111563 has 2 divisors, whose sum is σ = 257111564. Its totient is φ = 257111562.

The previous prime is 257111537. The next prime is 257111581. The reversal of 257111563 is 365111752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257111563 - 2²¹ = 255014411 is a prime.

It is a super-2 number, since 2×257111563² = 132212711656605938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (257111513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128555781 + 128555782.

It is an arithmetic number, because the mean of its divisors is an integer number (128555782).

Almost surely, 2^257111563 is an apocalyptic number.

257111563 is a deficient number, since it is larger than the sum of its proper divisors (1).

257111563 is an equidigital number, since it uses as much as digits as its factorization.

257111563 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 31.

The square root of 257111563 is about 16034.6987187162. The cubic root of 257111563 is about 635.8781023387.

The spelling of 257111563 in words is "two hundred fifty-seven million, one hundred eleven thousand, five hundred sixty-three".