1256631 has 8 divisors (see below), whose sum is σ = 1720944. Its totient is φ = 815040.

The previous prime is 1256621. The next prime is 1256659. The reversal of 1256631 is 1366521.

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

It is not a de Polignac number, because 1256631 - 2¹⁴ = 1240247 is a prime.

It is a super-2 number, since 2×1256631² = 3158242940322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256611) 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, 5550 + ... + 5771.

It is an arithmetic number, because the mean of its divisors is an integer number (215118).

2^1256631 is an apocalyptic number.

1256631 is a deficient number, since it is larger than the sum of its proper divisors (464313).

1256631 is a wasteful number, since it uses less digits than its factorization.

1256631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11361.

The product of its digits is 1080, while the sum is 24.

The square root of 1256631 is about 1120.9955396878. The cubic root of 1256631 is about 107.9118794224.

The spelling of 1256631 in words is "one million, two hundred fifty-six thousand, six hundred thirty-one".