2731390657 has 4 divisors (see below), whose sum is σ = 2875148080. Its totient is φ = 2587633236.

The previous prime is 2731390621. The next prime is 2731390667. The reversal of 2731390657 is 7560931372.

It is a happy number.

2731390657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2731390657 - 2²³ = 2723002049 is a prime.

It is a super-2 number, since 2×2731390657² = 14920989842293783298, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2731390667) 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, 71878683 + ... + 71878720.

It is an arithmetic number, because the mean of its divisors is an integer number (718787020).

Almost surely, 2^2731390657 is an apocalyptic number.

It is an amenable number.

2731390657 is a deficient number, since it is larger than the sum of its proper divisors (143757423).

2731390657 is a wasteful number, since it uses less digits than its factorization.

2731390657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143757422.

The product of its (nonzero) digits is 238140, while the sum is 43.

The square root of 2731390657 is about 52262.7080909514. The cubic root of 2731390657 is about 1397.8522607508.

The spelling of 2731390657 in words is "two billion, seven hundred thirty-one million, three hundred ninety thousand, six hundred fifty-seven".