561105155 has 8 divisors (see below), whose sum is σ = 725120592. Its totient is φ = 414354528.

The previous prime is 561105109. The next prime is 561105157. The reversal of 561105155 is 551501165.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 561105155 - 2⁶ = 561105091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (561105157) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4316129 + ... + 4316258.

It is an arithmetic number, because the mean of its divisors is an integer number (90640074).

Almost surely, 2^561105155 is an apocalyptic number.

561105155 is a deficient number, since it is larger than the sum of its proper divisors (164015437).

561105155 is a wasteful number, since it uses less digits than its factorization.

561105155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8632405.

The product of its (nonzero) digits is 3750, while the sum is 29.

The square root of 561105155 is about 23687.6582844316. The cubic root of 561105155 is about 824.7989249788.

The spelling of 561105155 in words is "five hundred sixty-one million, one hundred five thousand, one hundred fifty-five".