257191199 has 2 divisors, whose sum is σ = 257191200. Its totient is φ = 257191198.

The previous prime is 257191157. The next prime is 257191217. The reversal of 257191199 is 991191752.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257191199 is a prime.

It is a super-2 number, since 2×257191199² = 132294625686115202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257191499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128595599 + 128595600.

It is an arithmetic number, because the mean of its divisors is an integer number (128595600).

Almost surely, 2^257191199 is an apocalyptic number.

257191199 is a deficient number, since it is larger than the sum of its proper divisors (1).

257191199 is an equidigital number, since it uses as much as digits as its factorization.

257191199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51030, while the sum is 44.

The square root of 257191199 is about 16037.1817661334. The cubic root of 257191199 is about 635.9437464255.

The spelling of 257191199 in words is "two hundred fifty-seven million, one hundred ninety-one thousand, one hundred ninety-nine".