561012155 has 32 divisors (see below), whose sum is σ = 792358848. Its totient is φ = 376729600.

The previous prime is 561012149. The next prime is 561012161. The reversal of 561012155 is 551210165.

561012155 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (561012149) and next prime (561012161).

It is not a de Polignac number, because 561012155 - 2⁴ = 561012139 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43895 + ... + 55215.

It is an arithmetic number, because the mean of its divisors is an integer number (24761214).

Almost surely, 2^561012155 is an apocalyptic number.

561012155 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

561012155 is a deficient number, since it is larger than the sum of its proper divisors (231346693).

561012155 is a wasteful number, since it uses less digits than its factorization.

561012155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11407.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 561012155 is about 23685.6951555153. The cubic root of 561012155 is about 824.7533538782.

The spelling of 561012155 in words is "five hundred sixty-one million, twelve thousand, one hundred fifty-five".