252257639 has 2 divisors, whose sum is σ = 252257640. Its totient is φ = 252257638.

The previous prime is 252257591. The next prime is 252257653. The reversal of 252257639 is 936752252.

252257639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 252257639 - 2¹² = 252253543 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 252257596 and 252257605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252257669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126128819 + 126128820.

It is an arithmetic number, because the mean of its divisors is an integer number (126128820).

Almost surely, 2^252257639 is an apocalyptic number.

252257639 is a deficient number, since it is larger than the sum of its proper divisors (1).

252257639 is an equidigital number, since it uses as much as digits as its factorization.

252257639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 226800, while the sum is 41.

The square root of 252257639 is about 15882.6206590726. The cubic root of 252257639 is about 631.8511431387.

The spelling of 252257639 in words is "two hundred fifty-two million, two hundred fifty-seven thousand, six hundred thirty-nine".