561242164 has 24 divisors (see below), whose sum is σ = 1122992640. Its totient is φ = 240423456.

The previous prime is 561242147. The next prime is 561242173. The reversal of 561242164 is 461242165.

It is a happy number.

It is a congruent number.

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 in 7 ways as a sum of consecutive naturals, for example, 103677 + ... + 108955.

It is an arithmetic number, because the mean of its divisors is an integer number (46791360).

Almost surely, 2^561242164 is an apocalyptic number.

It is an amenable number.

561242164 is an abundant number, since it is smaller than the sum of its proper divisors (561750476).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

561242164 is a wasteful number, since it uses less digits than its factorization.

561242164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9087 (or 9085 counting only the distinct ones).

The product of its digits is 11520, while the sum is 31.

The square root of 561242164 is about 23690.5500991429. The cubic root of 561242164 is about 824.8660518375.

Subtracting from 561242164 its reverse (461242165), we obtain a palindrome (99999999).

The spelling of 561242164 in words is "five hundred sixty-one million, two hundred forty-two thousand, one hundred sixty-four".