1256771047431 has 4 divisors (see below), whose sum is σ = 1675694729912. Its totient is φ = 837847364952.

The previous prime is 1256771047429. The next prime is 1256771047439. The reversal of 1256771047431 is 1347401776521.

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

It is not a de Polignac number, because 1256771047431 - 2¹ = 1256771047429 is a prime.

It is a super-2 number, since 2×1256771047431² (a number of 25 digits) 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 (1256771047439) 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, 209461841236 + ... + 209461841241.

It is an arithmetic number, because the mean of its divisors is an integer number (418923682478).

Almost surely, 2^{1256771047431} is an apocalyptic number.

1256771047431 is a deficient number, since it is larger than the sum of its proper divisors (418923682481).

1256771047431 is an equidigital number, since it uses as much as digits as its factorization.

1256771047431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418923682480.

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 1256771047431 in words is "one trillion, two hundred fifty-six billion, seven hundred seventy-one million, forty-seven thousand, four hundred thirty-one".