15961155 has 32 divisors (see below), whose sum is σ = 29611008. Its totient is φ = 7190400.

The previous prime is 15961139. The next prime is 15961157. The reversal of 15961155 is 55116951.

15961155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 15961155 - 2⁴ = 15961139 is a prime.

It is not an unprimeable number, because it can be changed into a prime (15961157) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6385 + ... + 8525.

It is an arithmetic number, because the mean of its divisors is an integer number (925344).

Almost surely, 2^15961155 is an apocalyptic number.

15961155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

15961155 is a deficient number, since it is larger than the sum of its proper divisors (13649853).

15961155 is a wasteful number, since it uses less digits than its factorization.

15961155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2227.

The product of its digits is 6750, while the sum is 33.

The square root of 15961155 is about 3995.1414242802. The cubic root of 15961155 is about 251.7801212551.

The spelling of 15961155 in words is "fifteen million, nine hundred sixty-one thousand, one hundred fifty-five".