2155915144 has 8 divisors (see below), whose sum is σ = 4042340910. Its totient is φ = 1077957568.

The previous prime is 2155915141. The next prime is 2155915183. The reversal of 2155915144 is 4415195512.

It can be written as a sum of positive squares in only one way, i.e., 1416619044 + 739296100 = 37638^2 + 27190^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (2155915141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134744689 + ... + 134744704.

Almost surely, 2^2155915144 is an apocalyptic number.

It is an amenable number.

2155915144 is a deficient number, since it is larger than the sum of its proper divisors (1886425766).

2155915144 is a wasteful number, since it uses less digits than its factorization.

2155915144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269489399 (or 269489395 counting only the distinct ones).

The product of its digits is 36000, while the sum is 37.

The square root of 2155915144 is about 46431.8333043183. The cubic root of 2155915144 is about 1291.8454335569.

The spelling of 2155915144 in words is "two billion, one hundred fifty-five million, nine hundred fifteen thousand, one hundred forty-four".