90684709 has 2 divisors, whose sum is σ = 90684710. Its totient is φ = 90684708.

The previous prime is 90684691. The next prime is 90684719. The reversal of 90684709 is 90748609.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 78588225 + 12096484 = 8865^2 + 3478^2 .

It is a cyclic number.

It is not a de Polignac number, because 90684709 - 2⁵ = 90684677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90684719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45342354 + 45342355.

It is an arithmetic number, because the mean of its divisors is an integer number (45342355).

Almost surely, 2^90684709 is an apocalyptic number.

It is an amenable number.

90684709 is a deficient number, since it is larger than the sum of its proper divisors (1).

90684709 is an equidigital number, since it uses as much as digits as its factorization.

90684709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 90684709 is about 9522.8519362636. The cubic root of 90684709 is about 449.2740707302.

The spelling of 90684709 in words is "ninety million, six hundred eighty-four thousand, seven hundred nine".