90187 has 2 divisors, whose sum is σ = 90188. Its totient is φ = 90186.

The previous prime is 90173. The next prime is 90191. The reversal of 90187 is 78109.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90187 - 2⁷ = 90059 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (90107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45093 + 45094.

It is an arithmetic number, because the mean of its divisors is an integer number (45094).

2⁹⁰¹⁸⁷ is an apocalyptic number.

90187 is a deficient number, since it is larger than the sum of its proper divisors (1).

90187 is an equidigital number, since it uses as much as digits as its factorization.

90187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 90187 is about 300.3115049411. The cubic root of 90187 is about 44.8450638711.

It can be divided in two parts, 9018 and 7, that added together give a square (9025 = 95²).

The spelling of 90187 in words is "ninety thousand, one hundred eighty-seven".