91304491 has 8 divisors (see below), whose sum is σ = 92897280. Its totient is φ = 89725608.

The previous prime is 91304461. The next prime is 91304497. The reversal of 91304491 is 19440319.

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 91304491 - 2⁵ = 91304459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91304497) 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 7 ways as a sum of consecutive naturals, for example, 10230 + ... + 16948.

It is an arithmetic number, because the mean of its divisors is an integer number (11612160).

Almost surely, 2^91304491 is an apocalyptic number.

91304491 is a deficient number, since it is larger than the sum of its proper divisors (1592789).

91304491 is a wasteful number, since it uses less digits than its factorization.

91304491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6953.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 91304491 is about 9555.3383508906. The cubic root of 91304491 is about 450.2952646578.

The spelling of 91304491 in words is "ninety-one million, three hundred four thousand, four hundred ninety-one".