91611001 has 16 divisors (see below), whose sum is σ = 99437184. Its totient is φ = 84167424.

The previous prime is 91610969. The next prime is 91611059. The reversal of 91611001 is 10011619.

It is a cyclic number.

It is not a de Polignac number, because 91611001 - 2⁵ = 91610969 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 91611001.

It is not an unprimeable number, because it can be changed into a prime (91611061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 69985 + ... + 71281.

It is an arithmetic number, because the mean of its divisors is an integer number (6214824).

Almost surely, 2^91611001 is an apocalyptic number.

It is an amenable number.

91611001 is a deficient number, since it is larger than the sum of its proper divisors (7826183).

91611001 is a wasteful number, since it uses less digits than its factorization.

91611001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 54, while the sum is 19.

The square root of 91611001 is about 9571.3635914639. The cubic root of 91611001 is about 450.7985836171.

The spelling of 91611001 in words is "ninety-one million, six hundred eleven thousand, one".