52431521 has 2 divisors, whose sum is σ = 52431522. Its totient is φ = 52431520.

The previous prime is 52431499. The next prime is 52431527. The reversal of 52431521 is 12513425.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27040000 + 25391521 = 5200^2 + 5039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52431521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (52431527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26215760 + 26215761.

It is an arithmetic number, because the mean of its divisors is an integer number (26215761).

Almost surely, 2^52431521 is an apocalyptic number.

It is an amenable number.

52431521 is a deficient number, since it is larger than the sum of its proper divisors (1).

52431521 is an equidigital number, since it uses as much as digits as its factorization.

52431521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1200, while the sum is 23.

The square root of 52431521 is about 7240.9613312046. The cubic root of 52431521 is about 374.2807451939.

Adding to 52431521 its reverse (12513425), we get a palindrome (64944946).

The spelling of 52431521 in words is "fifty-two million, four hundred thirty-one thousand, five hundred twenty-one".