90636988187 has 2 divisors, whose sum is σ = 90636988188. Its totient is φ = 90636988186.

The previous prime is 90636988159. The next prime is 90636988199. The reversal of 90636988187 is 78188963609.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 90636988187 - 2¹² = 90636984091 is a prime.

It is a super-2 number, since 2×90636988187² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90636988487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45318494093 + 45318494094.

It is an arithmetic number, because the mean of its divisors is an integer number (45318494094).

Almost surely, 2^90636988187 is an apocalyptic number.

90636988187 is a deficient number, since it is larger than the sum of its proper divisors (1).

90636988187 is an equidigital number, since it uses as much as digits as its factorization.

90636988187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31352832, while the sum is 65.

The spelling of 90636988187 in words is "ninety billion, six hundred thirty-six million, nine hundred eighty-eight thousand, one hundred eighty-seven".