252720961 has 2 divisors, whose sum is σ = 252720962. Its totient is φ = 252720960.

The previous prime is 252720947. The next prime is 252720977. The reversal of 252720961 is 169027252.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 193738561 + 58982400 = 13919^2 + 7680^2 .

It is a cyclic number.

It is not a de Polignac number, because 252720961 - 2²³ = 244332353 is a prime.

It is not a weakly prime, because it can be changed into another prime (252720901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126360480 + 126360481.

It is an arithmetic number, because the mean of its divisors is an integer number (126360481).

Almost surely, 2^252720961 is an apocalyptic number.

It is an amenable number.

252720961 is a deficient number, since it is larger than the sum of its proper divisors (1).

252720961 is an equidigital number, since it uses as much as digits as its factorization.

252720961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 34.

The square root of 252720961 is about 15897.1997848678. The cubic root of 252720961 is about 632.2377472039.

The spelling of 252720961 in words is "two hundred fifty-two million, seven hundred twenty thousand, nine hundred sixty-one".