52531621 has 2 divisors, whose sum is σ = 52531622. Its totient is φ = 52531620.

The previous prime is 52531597. The next prime is 52531631. The reversal of 52531621 is 12613525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51638596 + 893025 = 7186^2 + 945^2 .

It is a cyclic number.

It is not a de Polignac number, because 52531621 - 2¹¹ = 52529573 is a prime.

It is equal to p_3143680 and since 52531621 and 3143680 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (52531631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26265810 + 26265811.

It is an arithmetic number, because the mean of its divisors is an integer number (26265811).

Almost surely, 2^52531621 is an apocalyptic number.

It is an amenable number.

52531621 is a deficient number, since it is larger than the sum of its proper divisors (1).

52531621 is an equidigital number, since it uses as much as digits as its factorization.

52531621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1800, while the sum is 25.

The square root of 52531621 is about 7247.8701009331. The cubic root of 52531621 is about 374.5187806646.

The spelling of 52531621 in words is "fifty-two million, five hundred thirty-one thousand, six hundred twenty-one".