257487531 has 8 divisors (see below), whose sum is σ = 392361984. Its totient is φ = 147135720.

The previous prime is 257487511. The next prime is 257487541. The reversal of 257487531 is 135784752.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 257487531 - 2⁶ = 257487467 is a prime.

It is a super-2 number, since 2×257487531² = 132599657240951922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (257487511) 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 7 ways as a sum of consecutive naturals, for example, 6130635 + ... + 6130676.

It is an arithmetic number, because the mean of its divisors is an integer number (49045248).

Almost surely, 2^257487531 is an apocalyptic number.

257487531 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

257487531 is a deficient number, since it is larger than the sum of its proper divisors (134874453).

257487531 is a wasteful number, since it uses less digits than its factorization.

257487531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12261321.

The product of its digits is 235200, while the sum is 42.

The square root of 257487531 is about 16046.4180115065. The cubic root of 257487531 is about 636.1878944272.

The spelling of 257487531 in words is "two hundred fifty-seven million, four hundred eighty-seven thousand, five hundred thirty-one".