56021491 has 8 divisors (see below), whose sum is σ = 58784544. Its totient is φ = 53285760.

The previous prime is 56021489. The next prime is 56021501. The reversal of 56021491 is 19412065.

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

It is a cyclic number.

It is not a de Polignac number, because 56021491 - 2¹ = 56021489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56021411) 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, 2566 + ... + 10891.

It is an arithmetic number, because the mean of its divisors is an integer number (7348068).

Almost surely, 2^56021491 is an apocalyptic number.

56021491 is a deficient number, since it is larger than the sum of its proper divisors (2763053).

56021491 is a wasteful number, since it uses less digits than its factorization.

56021491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13661.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 56021491 is about 7484.7505636461. The cubic root of 56021491 is about 382.6351717285.

The spelling of 56021491 in words is "fifty-six million, twenty-one thousand, four hundred ninety-one".