56004991 has 6 divisors (see below), whose sum is σ = 65148720. Its totient is φ = 48004236.

The previous prime is 56004979. The next prime is 56005009. The reversal of 56004991 is 19940065.

It is not a de Polignac number, because 56004991 - 2⁵ = 56004959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56004961) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 571431 + ... + 571528.

It is an arithmetic number, because the mean of its divisors is an integer number (10858120).

Almost surely, 2^56004991 is an apocalyptic number.

56004991 is a deficient number, since it is larger than the sum of its proper divisors (9143729).

56004991 is a wasteful number, since it uses less digits than its factorization.

56004991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1142973 (or 1142966 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 56004991 is about 7483.6482413326. The cubic root of 56004991 is about 382.5976022163.

The spelling of 56004991 in words is "fifty-six million, four thousand, nine hundred ninety-one".