91609607 has 4 divisors (see below), whose sum is σ = 91735320. Its totient is φ = 91483896.

The previous prime is 91609603. The next prime is 91609631. The reversal of 91609607 is 70690619.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91609607 - 2² = 91609603 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91609603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61757 + ... + 63222.

It is an arithmetic number, because the mean of its divisors is an integer number (22933830).

Almost surely, 2^91609607 is an apocalyptic number.

91609607 is a deficient number, since it is larger than the sum of its proper divisors (125713).

91609607 is a wasteful number, since it uses less digits than its factorization.

91609607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125712.

The product of its (nonzero) digits is 20412, while the sum is 38.

The square root of 91609607 is about 9571.2907697969. The cubic root of 91609607 is about 450.7962970780.

The spelling of 91609607 in words is "ninety-one million, six hundred nine thousand, six hundred seven".