187139331 has 6 divisors (see below), whose sum is σ = 270312380. Its totient is φ = 124759548.

The previous prime is 187139297. The next prime is 187139347. The reversal of 187139331 is 133931781.

It is not a de Polignac number, because 187139331 - 2¹¹ = 187137283 is a prime.

It is a super-2 number, since 2×187139331² = 70042258414255122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187139371) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10396621 + ... + 10396638.

Almost surely, 2^187139331 is an apocalyptic number.

187139331 is a deficient number, since it is larger than the sum of its proper divisors (83173049).

187139331 is a wasteful number, since it uses less digits than its factorization.

187139331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20793265 (or 20793262 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 187139331 is about 13679.8878284875. The cubic root of 187139331 is about 571.9898964342.

It can be divided in two parts, 1871393 and 31, that added together give a square (1871424 = 1368²).

The spelling of 187139331 in words is "one hundred eighty-seven million, one hundred thirty-nine thousand, three hundred thirty-one".