56424521 has 2 divisors, whose sum is σ = 56424522. Its totient is φ = 56424520.

The previous prime is 56424503. The next prime is 56424523. The reversal of 56424521 is 12542465.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53655625 + 2768896 = 7325^2 + 1664^2 .

It is a cyclic number.

It is not a de Polignac number, because 56424521 - 2¹⁴ = 56408137 is a prime.

Together with 56424523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (56424523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28212260 + 28212261.

It is an arithmetic number, because the mean of its divisors is an integer number (28212261).

Almost surely, 2^56424521 is an apocalyptic number.

It is an amenable number.

56424521 is a deficient number, since it is larger than the sum of its proper divisors (1).

56424521 is an equidigital number, since it uses as much as digits as its factorization.

56424521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9600, while the sum is 29.

The square root of 56424521 is about 7511.6257228379. The cubic root of 56424521 is about 383.5505651321.

Adding to 56424521 its reverse (12542465), we get a palindrome (68966986).

The spelling of 56424521 in words is "fifty-six million, four hundred twenty-four thousand, five hundred twenty-one".