257798899 has 2 divisors, whose sum is σ = 257798900. Its totient is φ = 257798898.

The previous prime is 257798887. The next prime is 257798903. The reversal of 257798899 is 998897752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257798899 is a prime.

It is a super-2 number, since 2×257798899² = 132920544651224402, 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 257798899.

It is not a weakly prime, because it can be changed into another prime (257718899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128899449 + 128899450.

It is an arithmetic number, because the mean of its divisors is an integer number (128899450).

Almost surely, 2^257798899 is an apocalyptic number.

257798899 is a deficient number, since it is larger than the sum of its proper divisors (1).

257798899 is an equidigital number, since it uses as much as digits as its factorization.

257798899 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 22861440, while the sum is 64.

The square root of 257798899 is about 16056.1171831797. The cubic root of 257798899 is about 636.4442288585. Note that the first 3 decimals are identical.

The spelling of 257798899 in words is "two hundred fifty-seven million, seven hundred ninety-eight thousand, eight hundred ninety-nine".