561621597 has 4 divisors (see below), whose sum is σ = 748828800. Its totient is φ = 374414396.

The previous prime is 561621563. The next prime is 561621601. The reversal of 561621597 is 795126165.

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 561621597 - 2¹¹ = 561619549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561621097) 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, 93603597 + ... + 93603602.

It is an arithmetic number, because the mean of its divisors is an integer number (187207200).

Almost surely, 2^561621597 is an apocalyptic number.

It is an amenable number.

561621597 is a deficient number, since it is larger than the sum of its proper divisors (187207203).

561621597 is a wasteful number, since it uses less digits than its factorization.

561621597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187207202.

The product of its digits is 113400, while the sum is 42.

The square root of 561621597 is about 23698.5568547960. The cubic root of 561621597 is about 825.0518960926.

The spelling of 561621597 in words is "five hundred sixty-one million, six hundred twenty-one thousand, five hundred ninety-seven".