561149918 has 16 divisors (see below), whose sum is σ = 987971424. Its totient is φ = 233992800.

The previous prime is 561149891. The next prime is 561149959. The reversal of 561149918 is 819941165.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541133 + ... + 542168.

It is an arithmetic number, because the mean of its divisors is an integer number (61748214).

Almost surely, 2^561149918 is an apocalyptic number.

561149918 is a deficient number, since it is larger than the sum of its proper divisors (426821506).

561149918 is a wasteful number, since it uses less digits than its factorization.

561149918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083347.

The product of its digits is 77760, while the sum is 44.

The square root of 561149918 is about 23688.6031247096. The cubic root of 561149918 is about 824.8208575834.

The spelling of 561149918 in words is "five hundred sixty-one million, one hundred forty-nine thousand, nine hundred eighteen".