2056515591 has 8 divisors (see below), whose sum is σ = 2952945520. Its totient is φ = 1265548032.

The previous prime is 2056515581. The next prime is 2056515607. The reversal of 2056515591 is 1955156502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2056515591 - 2¹³ = 2056507399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 52731169 = 2056515591 / (2 + 0 + 5 + 6 + 5 + 1 + 5 + 5 + 9 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2056515581) 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, 26365546 + ... + 26365623.

It is an arithmetic number, because the mean of its divisors is an integer number (369118190).

Almost surely, 2^2056515591 is an apocalyptic number.

2056515591 is a deficient number, since it is larger than the sum of its proper divisors (896429929).

2056515591 is a wasteful number, since it uses less digits than its factorization.

2056515591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52731185.

The product of its (nonzero) digits is 67500, while the sum is 39.

The square root of 2056515591 is about 45348.8212746484. The cubic root of 2056515591 is about 1271.6785194107.

The spelling of 2056515591 in words is "two billion, fifty-six million, five hundred fifteen thousand, five hundred ninety-one".