13151988 has 18 divisors (see below), whose sum is σ = 33245394. Its totient is φ = 4383984.

The previous prime is 13151977. The next prime is 13151989. The reversal of 13151988 is 88915131.

13151988 is a `hidden beast` number, since 131 + 519 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 8538084 + 4613904 = 2922^2 + 2148^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 365333 = 13151988 / (1 + 3 + 1 + 5 + 1 + 9 + 8 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13151989) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 182631 + ... + 182702.

Almost surely, 2^13151988 is an apocalyptic number.

13151988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

13151988 is an abundant number, since it is smaller than the sum of its proper divisors (20093406).

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

13151988 is a wasteful number, since it uses less digits than its factorization.

13151988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365343 (or 365338 counting only the distinct ones).

The product of its digits is 8640, while the sum is 36.

The square root of 13151988 is about 3626.5669716689. The cubic root of 13151988 is about 236.0462659461.

The spelling of 13151988 in words is "thirteen million, one hundred fifty-one thousand, nine hundred eighty-eight".