56491871 has 2 divisors, whose sum is σ = 56491872. Its totient is φ = 56491870.

The previous prime is 56491861. The next prime is 56491937. The reversal of 56491871 is 17819465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56491871 - 2¹⁴ = 56475487 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_3365879 and since 56491871 and 3365879 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56491811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28245935 + 28245936.

It is an arithmetic number, because the mean of its divisors is an integer number (28245936).

Almost surely, 2^56491871 is an apocalyptic number.

56491871 is a deficient number, since it is larger than the sum of its proper divisors (1).

56491871 is an equidigital number, since it uses as much as digits as its factorization.

56491871 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 60480, while the sum is 41.

The square root of 56491871 is about 7516.1074366989. The cubic root of 56491871 is about 383.7031102721.

The spelling of 56491871 in words is "fifty-six million, four hundred ninety-one thousand, eight hundred seventy-one".