187125989 has 2 divisors, whose sum is σ = 187125990. Its totient is φ = 187125988.

The previous prime is 187125973. The next prime is 187125997. The reversal of 187125989 is 989521781.

187125989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184063489 + 3062500 = 13567^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 187125989 - 2⁴ = 187125973 is a prime.

It is a super-2 number, since 2×187125989² = 70032271518456242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (187125929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 93562994 + 93562995.

It is an arithmetic number, because the mean of its divisors is an integer number (93562995).

Almost surely, 2^187125989 is an apocalyptic number.

It is an amenable number.

187125989 is a deficient number, since it is larger than the sum of its proper divisors (1).

187125989 is an equidigital number, since it uses as much as digits as its factorization.

187125989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 50.

The square root of 187125989 is about 13679.4001695981. The cubic root of 187125989 is about 571.9763028718.

The spelling of 187125989 in words is "one hundred eighty-seven million, one hundred twenty-five thousand, nine hundred eighty-nine".