56537891 has 2 divisors, whose sum is σ = 56537892. Its totient is φ = 56537890.

The previous prime is 56537879. The next prime is 56537927. The reversal of 56537891 is 19873565.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56537891 - 2¹⁰ = 56536867 is a prime.

It is not a weakly prime, because it can be changed into another prime (56537821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28268945 + 28268946.

It is an arithmetic number, because the mean of its divisors is an integer number (28268946).

Almost surely, 2^56537891 is an apocalyptic number.

56537891 is a deficient number, since it is larger than the sum of its proper divisors (1).

56537891 is an equidigital number, since it uses as much as digits as its factorization.

56537891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 226800, while the sum is 44.

The square root of 56537891 is about 7519.1682385753. The cubic root of 56537891 is about 383.8072740752.

The spelling of 56537891 in words is "fifty-six million, five hundred thirty-seven thousand, eight hundred ninety-one".