91612817 has 2 divisors, whose sum is σ = 91612818. Its totient is φ = 91612816.

The previous prime is 91612811. The next prime is 91612831. The reversal of 91612817 is 71821619.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 88529281 + 3083536 = 9409^2 + 1756^2 .

It is a cyclic number.

It is not a de Polignac number, because 91612817 - 2⁶ = 91612753 is a prime.

It is not a weakly prime, because it can be changed into another prime (91612811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45806408 + 45806409.

It is an arithmetic number, because the mean of its divisors is an integer number (45806409).

Almost surely, 2^91612817 is an apocalyptic number.

It is an amenable number.

91612817 is a deficient number, since it is larger than the sum of its proper divisors (1).

91612817 is an equidigital number, since it uses as much as digits as its factorization.

91612817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 35.

The square root of 91612817 is about 9571.4584573094. The cubic root of 91612817 is about 450.8015623162.

It can be divided in two parts, 91612 and 817, that added together give a palindrome (92429).

The spelling of 91612817 in words is "ninety-one million, six hundred twelve thousand, eight hundred seventeen".