91559407 has 2 divisors, whose sum is σ = 91559408. Its totient is φ = 91559406.

The previous prime is 91559383. The next prime is 91559411. The reversal of 91559407 is 70495519.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91559407 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91559407.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91559207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45779703 + 45779704.

It is an arithmetic number, because the mean of its divisors is an integer number (45779704).

Almost surely, 2^91559407 is an apocalyptic number.

91559407 is a deficient number, since it is larger than the sum of its proper divisors (1).

91559407 is an equidigital number, since it uses as much as digits as its factorization.

91559407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 91559407 is about 9568.6679846257. The cubic root of 91559407 is about 450.7139399625.

The spelling of 91559407 in words is "ninety-one million, five hundred fifty-nine thousand, four hundred seven".