90706591 has 2 divisors, whose sum is σ = 90706592. Its totient is φ = 90706590.

The previous prime is 90706529. The next prime is 90706597. The reversal of 90706591 is 19560709.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90706591 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90706591.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90706597) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45353295 + 45353296.

It is an arithmetic number, because the mean of its divisors is an integer number (45353296).

Almost surely, 2^90706591 is an apocalyptic number.

90706591 is a deficient number, since it is larger than the sum of its proper divisors (1).

90706591 is an equidigital number, since it uses as much as digits as its factorization.

90706591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 90706591 is about 9524.0007874842. Note that the first 3 decimals coincide. The cubic root of 90706591 is about 449.3102040714.

The spelling of 90706591 in words is "ninety million, seven hundred six thousand, five hundred ninety-one".