90199910189 has 2 divisors, whose sum is σ = 90199910190. Its totient is φ = 90199910188.

The previous prime is 90199910123. The next prime is 90199910191. The reversal of 90199910189 is 98101999109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71572300900 + 18627609289 = 267530^2 + 136483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90199910189 is a prime.

Together with 90199910191, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90193910189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45099955094 + 45099955095.

It is an arithmetic number, because the mean of its divisors is an integer number (45099955095).

Almost surely, 2^90199910189 is an apocalyptic number.

It is an amenable number.

90199910189 is a deficient number, since it is larger than the sum of its proper divisors (1).

90199910189 is an equidigital number, since it uses as much as digits as its factorization.

90199910189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 56.

The spelling of 90199910189 in words is "ninety billion, one hundred ninety-nine million, nine hundred ten thousand, one hundred eighty-nine".