56191911539 has 2 divisors, whose sum is σ = 56191911540. Its totient is φ = 56191911538.

The previous prime is 56191911521. The next prime is 56191911613. The reversal of 56191911539 is 93511919165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56191911539 - 2²⁰ = 56190862963 is a prime.

It is not a weakly prime, because it can be changed into another prime (56191911739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28095955769 + 28095955770.

It is an arithmetic number, because the mean of its divisors is an integer number (28095955770).

Almost surely, 2^56191911539 is an apocalyptic number.

56191911539 is a deficient number, since it is larger than the sum of its proper divisors (1).

56191911539 is an equidigital number, since it uses as much as digits as its factorization.

56191911539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 328050, while the sum is 50.

The spelling of 56191911539 in words is "fifty-six billion, one hundred ninety-one million, nine hundred eleven thousand, five hundred thirty-nine".