91609385 has 8 divisors (see below), whose sum is σ = 125635776. Its totient is φ = 62817840.

The previous prime is 91609381. The next prime is 91609403. The reversal of 91609385 is 58390619.

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

It is not a de Polignac number, because 91609385 - 2² = 91609381 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91609381) 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, 1308671 + ... + 1308740.

It is an arithmetic number, because the mean of its divisors is an integer number (15704472).

Almost surely, 2^91609385 is an apocalyptic number.

It is an amenable number.

91609385 is a deficient number, since it is larger than the sum of its proper divisors (34026391).

91609385 is a wasteful number, since it uses less digits than its factorization.

91609385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2617423.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 91609385 is about 9571.2791726080. The cubic root of 91609385 is about 450.7959329355.

The spelling of 91609385 in words is "ninety-one million, six hundred nine thousand, three hundred eighty-five".