188116987 has 2 divisors, whose sum is σ = 188116988. Its totient is φ = 188116986.

The previous prime is 188116963. The next prime is 188117009. The reversal of 188116987 is 789611881.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188116987 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188116987.

It is not a weakly prime, because it can be changed into another prime (188116937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94058493 + 94058494.

It is an arithmetic number, because the mean of its divisors is an integer number (94058494).

Almost surely, 2^188116987 is an apocalyptic number.

188116987 is a deficient number, since it is larger than the sum of its proper divisors (1).

188116987 is an equidigital number, since it uses as much as digits as its factorization.

188116987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 193536, while the sum is 49.

The square root of 188116987 is about 13715.5746142843. The cubic root of 188116987 is about 572.9842328606.

The spelling of 188116987 in words is "one hundred eighty-eight million, one hundred sixteen thousand, nine hundred eighty-seven".