257258999 has 2 divisors, whose sum is σ = 257259000. Its totient is φ = 257258998.

The previous prime is 257258941. The next prime is 257259017. The reversal of 257258999 is 999852752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257258999 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257218999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128629499 + 128629500.

It is an arithmetic number, because the mean of its divisors is an integer number (128629500).

Almost surely, 2^257258999 is an apocalyptic number.

257258999 is a deficient number, since it is larger than the sum of its proper divisors (1).

257258999 is an equidigital number, since it uses as much as digits as its factorization.

257258999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4082400, while the sum is 56.

The square root of 257258999 is about 16039.2954645770. The cubic root of 257258999 is about 635.9996233994. Note that the first 3 decimals are identical.

The spelling of 257258999 in words is "two hundred fifty-seven million, two hundred fifty-eight thousand, nine hundred ninety-nine".