257031145 has 32 divisors (see below), whose sum is σ = 372556800. Its totient is φ = 166297536.

The previous prime is 257031139. The next prime is 257031149. The reversal of 257031145 is 541130752.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 257031145 - 2⁵ = 257031113 is a prime.

It is a super-2 number, since 2×257031145² = 132130019000022050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257031149) 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 in 31 ways as a sum of consecutive naturals, for example, 203526 + ... + 204784.

It is an arithmetic number, because the mean of its divisors is an integer number (11642400).

Almost surely, 2^257031145 is an apocalyptic number.

It is an amenable number.

257031145 is a deficient number, since it is larger than the sum of its proper divisors (115525655).

257031145 is a wasteful number, since it uses less digits than its factorization.

257031145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 257031145 is about 16032.1908983146. The cubic root of 257031145 is about 635.8117998915.

Adding to 257031145 its reverse (541130752), we get a palindrome (798161897).

The spelling of 257031145 in words is "two hundred fifty-seven million, thirty-one thousand, one hundred forty-five".