56221501 has 4 divisors (see below), whose sum is σ = 64253152. Its totient is φ = 48189852.

The previous prime is 56221481. The next prime is 56221519. The reversal of 56221501 is 10512265.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56221501 - 2¹¹ = 56219453 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 (56221531) 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, 4015815 + ... + 4015828.

It is an arithmetic number, because the mean of its divisors is an integer number (16063288).

Almost surely, 2^56221501 is an apocalyptic number.

It is an amenable number.

56221501 is a deficient number, since it is larger than the sum of its proper divisors (8031651).

56221501 is an equidigital number, since it uses as much as digits as its factorization.

56221501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8031650.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 56221501 is about 7498.0998259559. The cubic root of 56221501 is about 383.0899969618.

Adding to 56221501 its reverse (10512265), we get a palindrome (66733766).

The spelling of 56221501 in words is "fifty-six million, two hundred twenty-one thousand, five hundred one".