91891201 has 8 divisors (see below), whose sum is σ = 97371200. Its totient is φ = 86475600.

The previous prime is 91891139. The next prime is 91891211. The reversal of 91891201 is 10219819.

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

It is a cyclic number.

It is not a de Polignac number, because 91891201 - 2⁷ = 91891073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91891211) 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 7 ways as a sum of consecutive naturals, for example, 13146 + ... + 18883.

It is an arithmetic number, because the mean of its divisors is an integer number (12171400).

Almost surely, 2^91891201 is an apocalyptic number.

It is an amenable number.

91891201 is a deficient number, since it is larger than the sum of its proper divisors (5479999).

91891201 is a wasteful number, since it uses less digits than its factorization.

91891201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32199.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 91891201 is about 9585.9898289118. The cubic root of 91891201 is about 451.2577177083.

The spelling of 91891201 in words is "ninety-one million, eight hundred ninety-one thousand, two hundred one".