56191813 has 2 divisors, whose sum is σ = 56191814. Its totient is φ = 56191812.

The previous prime is 56191787. The next prime is 56191843. The reversal of 56191813 is 31819165.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42810849 + 13380964 = 6543^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 56191813 - 2⁹ = 56191301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56191843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28095906 + 28095907.

It is an arithmetic number, because the mean of its divisors is an integer number (28095907).

Almost surely, 2^56191813 is an apocalyptic number.

It is an amenable number.

56191813 is a deficient number, since it is larger than the sum of its proper divisors (1).

56191813 is an equidigital number, since it uses as much as digits as its factorization.

56191813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 34.

The square root of 56191813 is about 7496.1198629691. The cubic root of 56191813 is about 383.0225543281.

The spelling of 56191813 in words is "fifty-six million, one hundred ninety-one thousand, eight hundred thirteen".