91609797 has 8 divisors (see below), whose sum is σ = 122339520. Its totient is φ = 60976640.

The previous prime is 91609783. The next prime is 91609853. The reversal of 91609797 is 79790619.

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 91609797 - 2⁴ = 91609781 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91609597) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21897 + ... + 25742.

It is an arithmetic number, because the mean of its divisors is an integer number (15292440).

Almost surely, 2^91609797 is an apocalyptic number.

It is an amenable number.

91609797 is a deficient number, since it is larger than the sum of its proper divisors (30729723).

91609797 is a wasteful number, since it uses less digits than its factorization.

91609797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48283.

The product of its (nonzero) digits is 214326, while the sum is 48.

The square root of 91609797 is about 9571.3006953078. The cubic root of 91609797 is about 450.7966087310.

The spelling of 91609797 in words is "ninety-one million, six hundred nine thousand, seven hundred ninety-seven".