90406691 has 2 divisors, whose sum is σ = 90406692. Its totient is φ = 90406690.

The previous prime is 90406669. The next prime is 90406727. The reversal of 90406691 is 19660409.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90406691 is a prime.

It is not a weakly prime, because it can be changed into another prime (90408691) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45203345 + 45203346.

It is an arithmetic number, because the mean of its divisors is an integer number (45203346).

Almost surely, 2^90406691 is an apocalyptic number.

90406691 is a deficient number, since it is larger than the sum of its proper divisors (1).

90406691 is an equidigital number, since it uses as much as digits as its factorization.

90406691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 90406691 is about 9508.2433183002. The cubic root of 90406691 is about 448.8144778460.

The spelling of 90406691 in words is "ninety million, four hundred six thousand, six hundred ninety-one".