56491819 has 2 divisors, whose sum is σ = 56491820. Its totient is φ = 56491818.

The previous prime is 56491811. The next prime is 56491829. The reversal of 56491819 is 91819465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56491819 - 2³ = 56491811 is a prime.

It is a super-2 number, since 2×56491819² = 6382651227857522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (56491811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28245909 + 28245910.

It is an arithmetic number, because the mean of its divisors is an integer number (28245910).

Almost surely, 2^56491819 is an apocalyptic number.

56491819 is a deficient number, since it is larger than the sum of its proper divisors (1).

56491819 is an equidigital number, since it uses as much as digits as its factorization.

56491819 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 43.

The square root of 56491819 is about 7516.1039774607. The cubic root of 56491819 is about 383.7029925409.

The spelling of 56491819 in words is "fifty-six million, four hundred ninety-one thousand, eight hundred nineteen".