91875321 has 12 divisors (see below), whose sum is σ = 132804672. Its totient is φ = 61205976.

The previous prime is 91875281. The next prime is 91875347. The reversal of 91875321 is 12357819.

It is not a de Polignac number, because 91875321 - 2⁶ = 91875257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91875221) 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 11 ways as a sum of consecutive naturals, for example, 13860 + ... + 19386.

It is an arithmetic number, because the mean of its divisors is an integer number (11067056).

Almost surely, 2^91875321 is an apocalyptic number.

It is an amenable number.

91875321 is a deficient number, since it is larger than the sum of its proper divisors (40929351).

91875321 is a wasteful number, since it uses less digits than its factorization.

91875321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380 (or 7377 counting only the distinct ones).

The product of its digits is 15120, while the sum is 36.

The square root of 91875321 is about 9585.1615009868. The cubic root of 91875321 is about 451.2317218012.

The spelling of 91875321 in words is "ninety-one million, eight hundred seventy-five thousand, three hundred twenty-one".