56530991 has 8 divisors (see below), whose sum is σ = 61896144. Its totient is φ = 51203520.

The previous prime is 56530979. The next prime is 56530993. The reversal of 56530991 is 19903565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56530991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56530993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6230 + ... + 12323.

It is an arithmetic number, because the mean of its divisors is an integer number (7737018).

Almost surely, 2^56530991 is an apocalyptic number.

56530991 is a deficient number, since it is larger than the sum of its proper divisors (5365153).

56530991 is a wasteful number, since it uses less digits than its factorization.

56530991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18841.

The product of its (nonzero) digits is 36450, while the sum is 38.

The square root of 56530991 is about 7518.7093972304. The cubic root of 56530991 is about 383.7916598981.

The spelling of 56530991 in words is "fifty-six million, five hundred thirty thousand, nine hundred ninety-one".