42624521 has 4 divisors (see below), whose sum is σ = 42717444. Its totient is φ = 42531600.

The previous prime is 42624511. The next prime is 42624523. The reversal of 42624521 is 12542624.

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 18966025 + 23658496 = 4355^2 + 4864^2 .

It is a cyclic number.

It is not a de Polignac number, because 42624521 - 2¹⁸ = 42362377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42624523) 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, 45770 + ... + 46691.

It is an arithmetic number, because the mean of its divisors is an integer number (10679361).

Almost surely, 2^42624521 is an apocalyptic number.

It is an amenable number.

42624521 is a deficient number, since it is larger than the sum of its proper divisors (92923).

42624521 is an equidigital number, since it uses as much as digits as its factorization.

42624521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92922.

The product of its digits is 3840, while the sum is 26.

The square root of 42624521 is about 6528.7457447813. The cubic root of 42624521 is about 349.3170928932.

The spelling of 42624521 in words is "forty-two million, six hundred twenty-four thousand, five hundred twenty-one".