2151161388 has 72 divisors (see below), whose sum is σ = 5884290048. Its totient is φ = 685870416.

The previous prime is 2151161371. The next prime is 2151161447. The reversal of 2151161388 is 8831611512.

2151161388 is a `hidden beast` number, since 2 + 1 + 511 + 6 + 138 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25756 + ... + 70467.

Almost surely, 2^2151161388 is an apocalyptic number.

It is an amenable number.

2151161388 is an abundant number, since it is smaller than the sum of its proper divisors (3733128660).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2151161388 is a wasteful number, since it uses less digits than its factorization.

2151161388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96265 (or 96251 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 2151161388 is about 46380.6143555689. The cubic root of 2151161388 is about 1290.8952357996.

The spelling of 2151161388 in words is "two billion, one hundred fifty-one million, one hundred sixty-one thousand, three hundred eighty-eight".