561908449 has 4 divisors (see below), whose sum is σ = 580034560. Its totient is φ = 543782340.

The previous prime is 561908443. The next prime is 561908471. The reversal of 561908449 is 944809165.

It is a happy number.

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 561908449 - 2²¹ = 559811297 is a prime.

It is a super-2 number, since 2×561908449² = 631482210115171202, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 561908399 and 561908408.

It is not an unprimeable number, because it can be changed into a prime (561908443) 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, 9063009 + ... + 9063070.

It is an arithmetic number, because the mean of its divisors is an integer number (145008640).

Almost surely, 2^561908449 is an apocalyptic number.

It is an amenable number.

561908449 is a deficient number, since it is larger than the sum of its proper divisors (18126111).

561908449 is a wasteful number, since it uses less digits than its factorization.

561908449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18126110.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 561908449 is about 23704.6081806893. The cubic root of 561908449 is about 825.1923391157.

The spelling of 561908449 in words is "five hundred sixty-one million, nine hundred eight thousand, four hundred forty-nine".