52531421 has 2 divisors, whose sum is σ = 52531422. Its totient is φ = 52531420.

The previous prime is 52531403. The next prime is 52531439. The reversal of 52531421 is 12413525.

It is a balanced prime because it is at equal distance from previous prime (52531403) and next prime (52531439).

It can be written as a sum of positive squares in only one way, i.e., 51998521 + 532900 = 7211^2 + 730^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52531421 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52531121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26265710 + 26265711.

It is an arithmetic number, because the mean of its divisors is an integer number (26265711).

Almost surely, 2^52531421 is an apocalyptic number.

It is an amenable number.

52531421 is a deficient number, since it is larger than the sum of its proper divisors (1).

52531421 is an equidigital number, since it uses as much as digits as its factorization.

52531421 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 52531421 is about 7247.8563037632. The cubic root of 52531421 is about 374.5183053709.

Adding to 52531421 its reverse (12413525), we get a palindrome (64944946).

The spelling of 52531421 in words is "fifty-two million, five hundred thirty-one thousand, four hundred twenty-one".