561438986 has 4 divisors (see below), whose sum is σ = 842158482. Its totient is φ = 280719492.

The previous prime is 561438979. The next prime is 561439009. The reversal of 561438986 is 689834165.

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

It can be written as a sum of positive squares in only one way, i.e., 558613225 + 2825761 = 23635^2 + 1681^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 140359745 + ... + 140359748.

Almost surely, 2^561438986 is an apocalyptic number.

561438986 is a deficient number, since it is larger than the sum of its proper divisors (280719496).

561438986 is a wasteful number, since it uses less digits than its factorization.

561438986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280719495.

The product of its digits is 1244160, while the sum is 50.

The square root of 561438986 is about 23694.7037542148. The cubic root of 561438986 is about 824.9624646528.

The spelling of 561438986 in words is "five hundred sixty-one million, four hundred thirty-eight thousand, nine hundred eighty-six".