561650637 has 4 divisors (see below), whose sum is σ = 748867520. Its totient is φ = 374433756.

The previous prime is 561650633. The next prime is 561650647. The reversal of 561650637 is 736056165.

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 not a de Polignac number, because 561650637 - 2² = 561650633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561650595 and 561650604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (561650633) 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, 93608437 + ... + 93608442.

It is an arithmetic number, because the mean of its divisors is an integer number (187216880).

Almost surely, 2^561650637 is an apocalyptic number.

It is an amenable number.

561650637 is a deficient number, since it is larger than the sum of its proper divisors (187216883).

561650637 is a wasteful number, since it uses less digits than its factorization.

561650637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187216882.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 561650637 is about 23699.1695424122. The cubic root of 561650637 is about 825.0661162807.

The spelling of 561650637 in words is "five hundred sixty-one million, six hundred fifty thousand, six hundred thirty-seven".