2056513691 has 2 divisors, whose sum is σ = 2056513692. Its totient is φ = 2056513690.

The previous prime is 2056513643. The next prime is 2056513709. The reversal of 2056513691 is 1963156502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2056513691 - 2²² = 2052319387 is a prime.

It is a super-2 number, since 2×2056513691² = 8458497122540886962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2056513631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1028256845 + 1028256846.

It is an arithmetic number, because the mean of its divisors is an integer number (1028256846).

Almost surely, 2^2056513691 is an apocalyptic number.

2056513691 is a deficient number, since it is larger than the sum of its proper divisors (1).

2056513691 is an equidigital number, since it uses as much as digits as its factorization.

2056513691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 38.

The square root of 2056513691 is about 45348.8003259182. The cubic root of 2056513691 is about 1271.6781277790.

The spelling of 2056513691 in words is "two billion, fifty-six million, five hundred thirteen thousand, six hundred ninety-one".