56491811 has 2 divisors, whose sum is σ = 56491812. Its totient is φ = 56491810.

The previous prime is 56491793. The next prime is 56491819. The reversal of 56491811 is 11819465.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56491811 - 2¹⁰ = 56490787 is a prime.

It is not a weakly prime, because it can be changed into another prime (56491819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28245905 + 28245906.

It is an arithmetic number, because the mean of its divisors is an integer number (28245906).

Almost surely, 2^56491811 is an apocalyptic number.

56491811 is a deficient number, since it is larger than the sum of its proper divisors (1).

56491811 is an equidigital number, since it uses as much as digits as its factorization.

56491811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 35.

The square root of 56491811 is about 7516.1034452700. The cubic root of 56491811 is about 383.7029744284.

The spelling of 56491811 in words is "fifty-six million, four hundred ninety-one thousand, eight hundred eleven".