252009661 has 2 divisors, whose sum is σ = 252009662. Its totient is φ = 252009660.

The previous prime is 252009631. The next prime is 252009671. The reversal of 252009661 is 166900252.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 250240761 + 1768900 = 15819^2 + 1330^2 .

It is a cyclic number.

It is not a de Polignac number, because 252009661 - 2¹⁹ = 251485373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (252009631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126004830 + 126004831.

It is an arithmetic number, because the mean of its divisors is an integer number (126004831).

Almost surely, 2^252009661 is an apocalyptic number.

It is an amenable number.

252009661 is a deficient number, since it is larger than the sum of its proper divisors (1).

252009661 is an equidigital number, since it uses as much as digits as its factorization.

252009661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 252009661 is about 15874.8121563690. The cubic root of 252009661 is about 631.6440314019.

The spelling of 252009661 in words is "two hundred fifty-two million, nine thousand, six hundred sixty-one".