91693121 has 16 divisors (see below), whose sum is σ = 105009408. Its totient is φ = 79315200.

The previous prime is 91693117. The next prime is 91693207. The reversal of 91693121 is 12139619.

It is not a de Polignac number, because 91693121 - 2² = 91693117 is a prime.

It is a Smith number, since the sum of its digits (32) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (91692121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59126 + ... + 60656.

It is an arithmetic number, because the mean of its divisors is an integer number (6563088).

Almost surely, 2^91693121 is an apocalyptic number.

It is an amenable number.

91693121 is a deficient number, since it is larger than the sum of its proper divisors (13316287).

91693121 is a wasteful number, since it uses less digits than its factorization.

91693121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832.

The product of its digits is 2916, while the sum is 32.

The square root of 91693121 is about 9575.6525104037. The cubic root of 91693121 is about 450.9332418399.

The spelling of 91693121 in words is "ninety-one million, six hundred ninety-three thousand, one hundred twenty-one".