257525399 has 2 divisors, whose sum is σ = 257525400. Its totient is φ = 257525398.

The previous prime is 257525381. The next prime is 257525413. The reversal of 257525399 is 993525752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257525399 is a prime.

It is a super-2 number, since 2×257525399² = 132638662260218402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257525309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128762699 + 128762700.

It is an arithmetic number, because the mean of its divisors is an integer number (128762700).

Almost surely, 2^257525399 is an apocalyptic number.

257525399 is a deficient number, since it is larger than the sum of its proper divisors (1).

257525399 is an equidigital number, since it uses as much as digits as its factorization.

257525399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 850500, while the sum is 47.

The square root of 257525399 is about 16047.5979199380. The cubic root of 257525399 is about 636.2190803804.

The spelling of 257525399 in words is "two hundred fifty-seven million, five hundred twenty-five thousand, three hundred ninety-nine".