56521001 has 4 divisors (see below), whose sum is σ = 57899604. Its totient is φ = 55142400.

The previous prime is 56520979. The next prime is 56521009. The reversal of 56521001 is 10012565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20939776 + 35581225 = 4576^2 + 5965^2 .

It is a cyclic number.

It is not a de Polignac number, because 56521001 - 2¹⁸ = 56258857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56521009) 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, 689240 + ... + 689321.

It is an arithmetic number, because the mean of its divisors is an integer number (14474901).

Almost surely, 2^56521001 is an apocalyptic number.

It is an amenable number.

56521001 is a deficient number, since it is larger than the sum of its proper divisors (1378603).

56521001 is a wasteful number, since it uses less digits than its factorization.

56521001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1378602.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 56521001 is about 7518.0450251379. The cubic root of 56521001 is about 383.7690510335.

Adding to 56521001 its reverse (10012565), we get a palindrome (66533566).

The spelling of 56521001 in words is "fifty-six million, five hundred twenty-one thousand, one".