90906791 has 2 divisors, whose sum is σ = 90906792. Its totient is φ = 90906790.

The previous prime is 90906749. The next prime is 90906839. The reversal of 90906791 is 19760909.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90906791 - 2¹⁰ = 90905767 is a prime.

It is a super-3 number, since 3×90906791³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90900791) 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, 45453395 + 45453396.

It is an arithmetic number, because the mean of its divisors is an integer number (45453396).

Almost surely, 2^90906791 is an apocalyptic number.

90906791 is a deficient number, since it is larger than the sum of its proper divisors (1).

90906791 is an equidigital number, since it uses as much as digits as its factorization.

90906791 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30618, while the sum is 41.

The square root of 90906791 is about 9534.5052834429. The cubic root of 90906791 is about 449.6405211401.

The spelling of 90906791 in words is "ninety million, nine hundred six thousand, seven hundred ninety-one".