90115693 has 2 divisors, whose sum is σ = 90115694. Its totient is φ = 90115692.

The previous prime is 90115661. The next prime is 90115699. The reversal of 90115693 is 39651109.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 86359849 + 3755844 = 9293^2 + 1938^2 .

It is a cyclic number.

It is not a de Polignac number, because 90115693 - 2⁵ = 90115661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90115699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45057846 + 45057847.

It is an arithmetic number, because the mean of its divisors is an integer number (45057847).

Almost surely, 2^90115693 is an apocalyptic number.

It is an amenable number.

90115693 is a deficient number, since it is larger than the sum of its proper divisors (1).

90115693 is an equidigital number, since it uses as much as digits as its factorization.

90115693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7290, while the sum is 34.

The square root of 90115693 is about 9492.9285786842. The cubic root of 90115693 is about 448.3324173070.

The spelling of 90115693 in words is "ninety million, one hundred fifteen thousand, six hundred ninety-three".