90389197 has 2 divisors, whose sum is σ = 90389198. Its totient is φ = 90389196.

The previous prime is 90389179. The next prime is 90389203. The reversal of 90389197 is 79198309.

Together with previous prime (90389179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76632516 + 13756681 = 8754^2 + 3709^2 .

It is a cyclic number.

It is not a de Polignac number, because 90389197 - 2¹¹ = 90387149 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90389797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45194598 + 45194599.

It is an arithmetic number, because the mean of its divisors is an integer number (45194599).

Almost surely, 2^90389197 is an apocalyptic number.

It is an amenable number.

90389197 is a deficient number, since it is larger than the sum of its proper divisors (1).

90389197 is an equidigital number, since it uses as much as digits as its factorization.

90389197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 122472, while the sum is 46.

The square root of 90389197 is about 9507.3233351980. The cubic root of 90389197 is about 448.7855269396.

It can be divided in two parts, 903 and 89197, that added together give a triangular number (90100 = T₄₂₄).

The spelling of 90389197 in words is "ninety million, three hundred eighty-nine thousand, one hundred ninety-seven".