188134987 has 2 divisors, whose sum is σ = 188134988. Its totient is φ = 188134986.

The previous prime is 188134951. The next prime is 188135029. The reversal of 188134987 is 789431881.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-188134987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 188134987.

It is not a weakly prime, because it can be changed into another prime (188134927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94067493 + 94067494.

It is an arithmetic number, because the mean of its divisors is an integer number (94067494).

Almost surely, 2^188134987 is an apocalyptic number.

188134987 is a deficient number, since it is larger than the sum of its proper divisors (1).

188134987 is an equidigital number, since it uses as much as digits as its factorization.

188134987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 387072, while the sum is 49.

The square root of 188134987 is about 13716.2307869181. The cubic root of 188134987 is about 573.0025076363.

The spelling of 188134987 in words is "one hundred eighty-eight million, one hundred thirty-four thousand, nine hundred eighty-seven".