90402097 has 2 divisors, whose sum is σ = 90402098. Its totient is φ = 90402096.

The previous prime is 90402083. The next prime is 90402113. The reversal of 90402097 is 79020409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86564416 + 3837681 = 9304^2 + 1959^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90402097 is a prime.

It is not a weakly prime, because it can be changed into another prime (90402797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45201048 + 45201049.

It is an arithmetic number, because the mean of its divisors is an integer number (45201049).

Almost surely, 2^90402097 is an apocalyptic number.

It is an amenable number.

90402097 is a deficient number, since it is larger than the sum of its proper divisors (1).

90402097 is an equidigital number, since it uses as much as digits as its factorization.

90402097 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 90402097 is about 9508.0017353806. The cubic root of 90402097 is about 448.8068755745.

The spelling of 90402097 in words is "ninety million, four hundred two thousand, ninety-seven".