1256541314631 has 4 divisors (see below), whose sum is σ = 1675388419512. Its totient is φ = 837694209752.

The previous prime is 1256541314597. The next prime is 1256541314681. The reversal of 1256541314631 is 1364131456521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1256541314631 - 2¹⁰ = 1256541313607 is a prime.

It is a super-2 number, since 2×1256541314631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256541314681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209423552436 + ... + 209423552441.

It is an arithmetic number, because the mean of its divisors is an integer number (418847104878).

Almost surely, 2^{1256541314631} is an apocalyptic number.

1256541314631 is a deficient number, since it is larger than the sum of its proper divisors (418847104881).

1256541314631 is an equidigital number, since it uses as much as digits as its factorization.

1256541314631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418847104880.

The product of its digits is 259200, while the sum is 42.

The spelling of 1256541314631 in words is "one trillion, two hundred fifty-six billion, five hundred forty-one million, three hundred fourteen thousand, six hundred thirty-one".