561612345 has 16 divisors (see below), whose sum is σ = 1026948480. Its totient is φ = 256737024.

The previous prime is 561612329. The next prime is 561612349. The reversal of 561612345 is 543216165.

It is not a de Polignac number, because 561612345 - 2⁴ = 561612329 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (561612349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2674240 + ... + 2674449.

It is an arithmetic number, because the mean of its divisors is an integer number (64184280).

Almost surely, 2^561612345 is an apocalyptic number.

It is an amenable number.

561612345 is a deficient number, since it is larger than the sum of its proper divisors (465336135).

561612345 is a wasteful number, since it uses less digits than its factorization.

561612345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5348704.

The product of its digits is 21600, while the sum is 33.

The square root of 561612345 is about 23698.3616522324. The cubic root of 561612345 is about 825.0473655083.

The spelling of 561612345 in words is "five hundred sixty-one million, six hundred twelve thousand, three hundred forty-five".