91065601 has 16 divisors (see below), whose sum is σ = 101243520. Its totient is φ = 81220480.

The previous prime is 91065593. The next prime is 91065641. The reversal of 91065601 is 10656019.

It is not a de Polignac number, because 91065601 - 2³ = 91065593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91065601.

It is not an unprimeable number, because it can be changed into a prime (91065641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163215 + ... + 163771.

It is an arithmetic number, because the mean of its divisors is an integer number (6327720).

Almost surely, 2^91065601 is an apocalyptic number.

It is an amenable number.

91065601 is a deficient number, since it is larger than the sum of its proper divisors (10177919).

91065601 is a wasteful number, since it uses less digits than its factorization.

91065601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 824.

The product of its (nonzero) digits is 1620, while the sum is 28.

The square root of 91065601 is about 9542.8298213895. The cubic root of 91065601 is about 449.9022026158.

The spelling of 91065601 in words is "ninety-one million, sixty-five thousand, six hundred one".