56443991 has 2 divisors, whose sum is σ = 56443992. Its totient is φ = 56443990.

The previous prime is 56443987. The next prime is 56443997. The reversal of 56443991 is 19934465.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 56443991 - 2² = 56443987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56443997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28221995 + 28221996.

It is an arithmetic number, because the mean of its divisors is an integer number (28221996).

Almost surely, 2^56443991 is an apocalyptic number.

56443991 is a deficient number, since it is larger than the sum of its proper divisors (1).

56443991 is an equidigital number, since it uses as much as digits as its factorization.

56443991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 41.

The square root of 56443991 is about 7512.9216021465. The cubic root of 56443991 is about 383.5946763955.

The spelling of 56443991 in words is "fifty-six million, four hundred forty-three thousand, nine hundred ninety-one".