561104251 has 4 divisors (see below), whose sum is σ = 585500112. Its totient is φ = 536708392.

The previous prime is 561104239. The next prime is 561104281. The reversal of 561104251 is 152401165.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561104251 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561104231) 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, 12197896 + ... + 12197941.

It is an arithmetic number, because the mean of its divisors is an integer number (146375028).

Almost surely, 2^561104251 is an apocalyptic number.

561104251 is a deficient number, since it is larger than the sum of its proper divisors (24395861).

561104251 is a wasteful number, since it uses less digits than its factorization.

561104251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24395860.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 561104251 is about 23687.6392027572. The cubic root of 561104251 is about 824.7984820323.

The spelling of 561104251 in words is "five hundred sixty-one million, one hundred four thousand, two hundred fifty-one".