252061561 has 2 divisors, whose sum is σ = 252061562. Its totient is φ = 252061560.

The previous prime is 252061507. The next prime is 252061597. The reversal of 252061561 is 165160252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 232745536 + 19316025 = 15256^2 + 4395^2 .

It is a cyclic number.

It is not a de Polignac number, because 252061561 - 2¹⁷ = 251930489 is a prime.

It is not a weakly prime, because it can be changed into another prime (252061861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126030780 + 126030781.

It is an arithmetic number, because the mean of its divisors is an integer number (126030781).

Almost surely, 2^252061561 is an apocalyptic number.

It is an amenable number.

252061561 is a deficient number, since it is larger than the sum of its proper divisors (1).

252061561 is an equidigital number, since it uses as much as digits as its factorization.

252061561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 252061561 is about 15876.4467372268. The cubic root of 252061561 is about 631.6873896273.

The spelling of 252061561 in words is "two hundred fifty-two million, sixty-one thousand, five hundred sixty-one".