91161001 has 4 divisors (see below), whose sum is σ = 91198404. Its totient is φ = 91123600.

The previous prime is 91160969. The next prime is 91161019. The reversal of 91161001 is 10016119.

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

It can be written as a sum of positive squares in 2 ways, for example, as 54243225 + 36917776 = 7365^2 + 6076^2 .

It is a cyclic number.

It is not a de Polignac number, because 91161001 - 2⁵ = 91160969 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 91161001.

It is not an unprimeable number, because it can be changed into a prime (91161401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14770 + ... + 20011.

It is an arithmetic number, because the mean of its divisors is an integer number (22799601).

Almost surely, 2^91161001 is an apocalyptic number.

It is an amenable number.

91161001 is a deficient number, since it is larger than the sum of its proper divisors (37403).

91161001 is a wasteful number, since it uses less digits than its factorization.

91161001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37402.

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

The square root of 91161001 is about 9547.8270302724. The cubic root of 91161001 is about 450.0592531029.

The spelling of 91161001 in words is "ninety-one million, one hundred sixty-one thousand, one".