56291891 has 2 divisors, whose sum is σ = 56291892. Its totient is φ = 56291890.

The previous prime is 56291867. The next prime is 56291899. The reversal of 56291891 is 19819265.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56291891 - 2¹⁴ = 56275507 is a prime.

It is not a weakly prime, because it can be changed into another prime (56291899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28145945 + 28145946.

It is an arithmetic number, because the mean of its divisors is an integer number (28145946).

Almost surely, 2^56291891 is an apocalyptic number.

56291891 is a deficient number, since it is larger than the sum of its proper divisors (1).

56291891 is an equidigital number, since it uses as much as digits as its factorization.

56291891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 38880, while the sum is 41.

The square root of 56291891 is about 7502.7922135696. The cubic root of 56291891 is about 383.2498080568.

The spelling of 56291891 in words is "fifty-six million, two hundred ninety-one thousand, eight hundred ninety-one".