257345111 has 2 divisors, whose sum is σ = 257345112. Its totient is φ = 257345110.

The previous prime is 257345089. The next prime is 257345113. The reversal of 257345111 is 111543752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257345111 - 2¹⁸ = 257082967 is a prime.

Together with 257345113, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257345113) 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, 128672555 + 128672556.

It is an arithmetic number, because the mean of its divisors is an integer number (128672556).

Almost surely, 2^257345111 is an apocalyptic number.

257345111 is a deficient number, since it is larger than the sum of its proper divisors (1).

257345111 is an equidigital number, since it uses as much as digits as its factorization.

257345111 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4200, while the sum is 29.

The square root of 257345111 is about 16041.9796471633. The cubic root of 257345111 is about 636.0705779500.

Adding to 257345111 its reverse (111543752), we get a palindrome (368888863).

The spelling of 257345111 in words is "two hundred fifty-seven million, three hundred forty-five thousand, one hundred eleven".