561653251 has 2 divisors, whose sum is σ = 561653252. Its totient is φ = 561653250.

The previous prime is 561653203. The next prime is 561653333. The reversal of 561653251 is 152356165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561653251 - 2¹⁹ = 561128963 is a prime.

It is not a weakly prime, because it can be changed into another prime (561653201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280826625 + 280826626.

It is an arithmetic number, because the mean of its divisors is an integer number (280826626).

Almost surely, 2^561653251 is an apocalyptic number.

561653251 is a deficient number, since it is larger than the sum of its proper divisors (1).

561653251 is an equidigital number, since it uses as much as digits as its factorization.

561653251 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27000, while the sum is 34.

The square root of 561653251 is about 23699.2246919599. The cubic root of 561653251 is about 825.0673962694.

The spelling of 561653251 in words is "five hundred sixty-one million, six hundred fifty-three thousand, two hundred fifty-one".