2957131781 has 4 divisors (see below), whose sum is σ = 3085702752. Its totient is φ = 2828560812.

The previous prime is 2957131679. The next prime is 2957131783. The reversal of 2957131781 is 1871317592.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2957131781 - 2¹⁴ = 2957115397 is a prime.

It is a super-2 number, since 2×2957131781² = 17489256740400463922, 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 (2957131783) 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, 64285451 + ... + 64285496.

It is an arithmetic number, because the mean of its divisors is an integer number (771425688).

Almost surely, 2^2957131781 is an apocalyptic number.

It is an amenable number.

2957131781 is a deficient number, since it is larger than the sum of its proper divisors (128570971).

2957131781 is a wasteful number, since it uses less digits than its factorization.

2957131781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128570970.

The product of its digits is 105840, while the sum is 44.

The square root of 2957131781 is about 54379.5161894624. The cubic root of 2957131781 is about 1435.3469570228.

The spelling of 2957131781 in words is "two billion, nine hundred fifty-seven million, one hundred thirty-one thousand, seven hundred eighty-one".