56036394391 has 2 divisors, whose sum is σ = 56036394392. Its totient is φ = 56036394390.

The previous prime is 56036394389. The next prime is 56036394473. The reversal of 56036394391 is 19349363065.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56036394391 - 2¹ = 56036394389 is a prime.

Together with 56036394389, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56036394301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28018197195 + 28018197196.

It is an arithmetic number, because the mean of its divisors is an integer number (28018197196).

Almost surely, 2^56036394391 is an apocalyptic number.

56036394391 is a deficient number, since it is larger than the sum of its proper divisors (1).

56036394391 is an equidigital number, since it uses as much as digits as its factorization.

56036394391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1574640, while the sum is 49.

The spelling of 56036394391 in words is "fifty-six billion, thirty-six million, three hundred ninety-four thousand, three hundred ninety-one".