56181899 has 2 divisors, whose sum is σ = 56181900. Its totient is φ = 56181898.

The previous prime is 56181883. The next prime is 56181907. The reversal of 56181899 is 99818165.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56181899 - 2⁴ = 56181883 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56181859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28090949 + 28090950.

It is an arithmetic number, because the mean of its divisors is an integer number (28090950).

Almost surely, 2^56181899 is an apocalyptic number.

56181899 is a deficient number, since it is larger than the sum of its proper divisors (1).

56181899 is an equidigital number, since it uses as much as digits as its factorization.

56181899 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 47.

The square root of 56181899 is about 7495.4585583539. The cubic root of 56181899 is about 383.0000272686. Note that the first 4 decimals are identical.

The spelling of 56181899 in words is "fifty-six million, one hundred eighty-one thousand, eight hundred ninety-nine".