91483721 has 16 divisors (see below), whose sum is σ = 107761920. Its totient is φ = 76023360.

The previous prime is 91483709. The next prime is 91483771. The reversal of 91483721 is 12738419.

It is not a de Polignac number, because 91483721 - 2⁶ = 91483657 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91483771) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108620 + ... + 109458.

It is an arithmetic number, because the mean of its divisors is an integer number (6735120).

Almost surely, 2^91483721 is an apocalyptic number.

It is an amenable number.

91483721 is a deficient number, since it is larger than the sum of its proper divisors (16278199).

91483721 is a wasteful number, since it uses less digits than its factorization.

91483721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1304.

The product of its digits is 12096, while the sum is 35.

The square root of 91483721 is about 9564.7122800427. The cubic root of 91483721 is about 450.5897140992.

The spelling of 91483721 in words is "ninety-one million, four hundred eighty-three thousand, seven hundred twenty-one".