56215451 has 4 divisors (see below), whose sum is σ = 56372400. Its totient is φ = 56058504.

The previous prime is 56215441. The next prime is 56215459. The reversal of 56215451 is 15451265.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15451265 = 5 ⋅3090253.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56215451 is a prime.

It is a super-2 number, since 2×56215451² = 6320353862266802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56215459) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77936 + ... + 78653.

It is an arithmetic number, because the mean of its divisors is an integer number (14093100).

Almost surely, 2^56215451 is an apocalyptic number.

56215451 is a deficient number, since it is larger than the sum of its proper divisors (156949).

56215451 is a wasteful number, since it uses less digits than its factorization.

56215451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156948.

The product of its digits is 6000, while the sum is 29.

The square root of 56215451 is about 7497.6963795555. The cubic root of 56215451 is about 383.0762550210.

The spelling of 56215451 in words is "fifty-six million, two hundred fifteen thousand, four hundred fifty-one".