61100155 has 4 divisors (see below), whose sum is σ = 73320192. Its totient is φ = 48880120.

The previous prime is 61100147. The next prime is 61100173. The reversal of 61100155 is 55100116.

61100155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 61100155 - 2³ = 61100147 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 6110011 + ... + 6110020.

It is an arithmetic number, because the mean of its divisors is an integer number (18330048).

Almost surely, 2^61100155 is an apocalyptic number.

61100155 is a deficient number, since it is larger than the sum of its proper divisors (12220037).

61100155 is a wasteful number, since it uses less digits than its factorization.

61100155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12220036.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 61100155 is about 7816.6588130735. The cubic root of 61100155 is about 393.8650430619.

The spelling of 61100155 in words is "sixty-one million, one hundred thousand, one hundred fifty-five".