257138311 has 4 divisors (see below), whose sum is σ = 272264112. Its totient is φ = 242012512.

The previous prime is 257138309. The next prime is 257138369. The reversal of 257138311 is 113831752.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 257138311 - 2¹ = 257138309 is a prime.

It is a super-2 number, since 2×257138311² = 132240221967865442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257138111) 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 in 3 ways as a sum of consecutive naturals, for example, 7562875 + ... + 7562908.

It is an arithmetic number, because the mean of its divisors is an integer number (68066028).

Almost surely, 2^257138311 is an apocalyptic number.

257138311 is a deficient number, since it is larger than the sum of its proper divisors (15125801).

257138311 is a wasteful number, since it uses less digits than its factorization.

257138311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15125800.

The product of its digits is 5040, while the sum is 31.

The square root of 257138311 is about 16035.5327632106. The cubic root of 257138311 is about 635.9001522710.

The spelling of 257138311 in words is "two hundred fifty-seven million, one hundred thirty-eight thousand, three hundred eleven".