1256134631 has 8 divisors (see below), whose sum is σ = 1343924400. Its totient is φ = 1170512640.

The previous prime is 1256134613. The next prime is 1256134651. The reversal of 1256134631 is 1364316521.

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 1256134631 - 2³⁰ = 182392807 is a prime.

It is a super-2 number, since 2×1256134631² = 3155748422395012322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256134651) 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, 540746 + ... + 543063.

It is an arithmetic number, because the mean of its divisors is an integer number (167990550).

Almost surely, 2^1256134631 is an apocalyptic number.

1256134631 is a deficient number, since it is larger than the sum of its proper divisors (87789769).

1256134631 is a wasteful number, since it uses less digits than its factorization.

1256134631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083889.

The product of its digits is 12960, while the sum is 32.

The square root of 1256134631 is about 35441.9896591599. The cubic root of 1256134631 is about 1078.9766916075.

The spelling of 1256134631 in words is "one billion, two hundred fifty-six million, one hundred thirty-four thousand, six hundred thirty-one".