561311297 has 4 divisors (see below), whose sum is σ = 585716160. Its totient is φ = 536906436.

The previous prime is 561311263. The next prime is 561311339. The reversal of 561311297 is 792113165.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 561311297 - 2²⁸ = 292875841 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561311897) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12202397 + ... + 12202442.

It is an arithmetic number, because the mean of its divisors is an integer number (146429040).

Almost surely, 2^561311297 is an apocalyptic number.

It is an amenable number.

561311297 is a deficient number, since it is larger than the sum of its proper divisors (24404863).

561311297 is a wasteful number, since it uses less digits than its factorization.

561311297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24404862.

The product of its digits is 11340, while the sum is 35.

The square root of 561311297 is about 23692.0091381039. The cubic root of 561311297 is about 824.8999190503.

The spelling of 561311297 in words is "five hundred sixty-one million, three hundred eleven thousand, two hundred ninety-seven".