91611617 has 2 divisors, whose sum is σ = 91611618. Its totient is φ = 91611616.

The previous prime is 91611547. The next prime is 91611643. The reversal of 91611617 is 71611619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90174016 + 1437601 = 9496^2 + 1199^2 .

It is an emirp because it is prime and its reverse (71611619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91611617 - 2⁸ = 91611361 is a prime.

It is not a weakly prime, because it can be changed into another prime (91611647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45805808 + 45805809.

It is an arithmetic number, because the mean of its divisors is an integer number (45805809).

Almost surely, 2^91611617 is an apocalyptic number.

It is an amenable number.

91611617 is a deficient number, since it is larger than the sum of its proper divisors (1).

91611617 is an equidigital number, since it uses as much as digits as its factorization.

91611617 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2268, while the sum is 32.

The square root of 91611617 is about 9571.3957707327. The cubic root of 91611617 is about 450.7995940172.

The spelling of 91611617 in words is "ninety-one million, six hundred eleven thousand, six hundred seventeen".