91609679 has 8 divisors (see below), whose sum is σ = 104770848. Its totient is φ = 78467040.

The previous prime is 91609663. The next prime is 91609691. The reversal of 91609679 is 97690619.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91609679 - 2⁴ = 91609663 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91609649) 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 in 7 ways as a sum of consecutive naturals, for example, 8429 + ... + 15945.

It is an arithmetic number, because the mean of its divisors is an integer number (13096356).

Almost surely, 2^91609679 is an apocalyptic number.

91609679 is a deficient number, since it is larger than the sum of its proper divisors (13161169).

91609679 is a wasteful number, since it uses less digits than its factorization.

91609679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9265.

The product of its (nonzero) digits is 183708, while the sum is 47.

The square root of 91609679 is about 9571.2945310444. The cubic root of 91609679 is about 450.7964151781.

The spelling of 91609679 in words is "ninety-one million, six hundred nine thousand, six hundred seventy-nine".