90684691 has 2 divisors, whose sum is σ = 90684692. Its totient is φ = 90684690.

The previous prime is 90684689. The next prime is 90684709. The reversal of 90684691 is 19648609.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90684691 - 2¹ = 90684689 is a prime.

Together with 90684689, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (90684611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45342345 + 45342346.

It is an arithmetic number, because the mean of its divisors is an integer number (45342346).

Almost surely, 2^90684691 is an apocalyptic number.

90684691 is a deficient number, since it is larger than the sum of its proper divisors (1).

90684691 is an equidigital number, since it uses as much as digits as its factorization.

90684691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 90684691 is about 9522.8509911686. The cubic root of 90684691 is about 449.2740410047.

The spelling of 90684691 in words is "ninety million, six hundred eighty-four thousand, six hundred ninety-one".