90311189 has 2 divisors, whose sum is σ = 90311190. Its totient is φ = 90311188.

The previous prime is 90311173. The next prime is 90311197. The reversal of 90311189 is 98111309.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87572164 + 2739025 = 9358^2 + 1655^2 .

It is a cyclic number.

It is not a de Polignac number, because 90311189 - 2⁴ = 90311173 is a prime.

It is a super-2 number, since 2×90311189² = 16312221717187442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90311119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45155594 + 45155595.

It is an arithmetic number, because the mean of its divisors is an integer number (45155595).

Almost surely, 2^90311189 is an apocalyptic number.

It is an amenable number.

90311189 is a deficient number, since it is larger than the sum of its proper divisors (1).

90311189 is an equidigital number, since it uses as much as digits as its factorization.

90311189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 32.

The square root of 90311189 is about 9503.2199280034. The cubic root of 90311189 is about 448.6563856316.

The spelling of 90311189 in words is "ninety million, three hundred eleven thousand, one hundred eighty-nine".