252621613 has 2 divisors, whose sum is σ = 252621614. Its totient is φ = 252621612.

The previous prime is 252621559. The next prime is 252621617. The reversal of 252621613 is 316126252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231709284 + 20912329 = 15222^2 + 4573^2 .

It is a cyclic number.

It is not a de Polignac number, because 252621613 - 2⁹ = 252621101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252621617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126310806 + 126310807.

It is an arithmetic number, because the mean of its divisors is an integer number (126310807).

Almost surely, 2^252621613 is an apocalyptic number.

It is an amenable number.

252621613 is a deficient number, since it is larger than the sum of its proper divisors (1).

252621613 is an equidigital number, since it uses as much as digits as its factorization.

252621613 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 28.

The square root of 252621613 is about 15894.0747764694. The cubic root of 252621613 is about 632.1548892989.

Adding to 252621613 its reverse (316126252), we get a palindrome (568747865).

The spelling of 252621613 in words is "two hundred fifty-two million, six hundred twenty-one thousand, six hundred thirteen".