256531629 has 8 divisors (see below), whose sum is σ = 350384832. Its totient is φ = 166849760.

The previous prime is 256531601. The next prime is 256531637. The reversal of 256531629 is 926135652.

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

It is a cyclic number.

It is not a de Polignac number, because 256531629 - 2⁹ = 256531117 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256531229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1042689 + ... + 1042934.

It is an arithmetic number, because the mean of its divisors is an integer number (43798104).

Almost surely, 2^256531629 is an apocalyptic number.

It is an amenable number.

256531629 is a deficient number, since it is larger than the sum of its proper divisors (93853203).

256531629 is a wasteful number, since it uses less digits than its factorization.

256531629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2085667.

The product of its digits is 97200, while the sum is 39.

The square root of 256531629 is about 16016.6047900296. The cubic root of 256531629 is about 635.3996525228.

The spelling of 256531629 in words is "two hundred fifty-six million, five hundred thirty-one thousand, six hundred twenty-nine".