90869797 has 2 divisors, whose sum is σ = 90869798. Its totient is φ = 90869796.

The previous prime is 90869749. The next prime is 90869833. The reversal of 90869797 is 79796809.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82609921 + 8259876 = 9089^2 + 2874^2 .

It is an emirp because it is prime and its reverse (79796809) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90869797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90869747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45434898 + 45434899.

It is an arithmetic number, because the mean of its divisors is an integer number (45434899).

Almost surely, 2^90869797 is an apocalyptic number.

It is an amenable number.

90869797 is a deficient number, since it is larger than the sum of its proper divisors (1).

90869797 is an equidigital number, since it uses as much as digits as its factorization.

90869797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1714608, while the sum is 55.

The square root of 90869797 is about 9532.5650797674. The cubic root of 90869797 is about 449.5795199830.

The spelling of 90869797 in words is "ninety million, eight hundred sixty-nine thousand, seven hundred ninety-seven".