187039081 has 2 divisors, whose sum is σ = 187039082. Its totient is φ = 187039080.

The previous prime is 187039079. The next prime is 187039087. The reversal of 187039081 is 180930781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 170563600 + 16475481 = 13060^2 + 4059^2 .

It is a cyclic number.

It is not a de Polignac number, because 187039081 - 2¹ = 187039079 is a prime.

It is a super-2 number, since 2×187039081² = 69967235642649122, which contains 22 as substring.

Together with 187039079, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 187039081.

It is not a weakly prime, because it can be changed into another prime (187039087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93519540 + 93519541.

It is an arithmetic number, because the mean of its divisors is an integer number (93519541).

Almost surely, 2^187039081 is an apocalyptic number.

It is an amenable number.

187039081 is a deficient number, since it is larger than the sum of its proper divisors (1).

187039081 is an equidigital number, since it uses as much as digits as its factorization.

187039081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 187039081 is about 13676.2231994071. The cubic root of 187039081 is about 571.8877404111.

The spelling of 187039081 in words is "one hundred eighty-seven million, thirty-nine thousand, eighty-one".