91014921 has 28 divisors (see below), whose sum is σ = 143663920. Its totient is φ = 57474360.

The previous prime is 91014901. The next prime is 91014929. The reversal of 91014921 is 12941019.

It is not a de Polignac number, because 91014921 - 2¹⁵ = 90982153 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91014929) 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 27 ways as a sum of consecutive naturals, for example, 10566 + ... + 17136.

Almost surely, 2^91014921 is an apocalyptic number.

It is an amenable number.

91014921 is a deficient number, since it is larger than the sum of its proper divisors (52648999).

91014921 is an equidigital number, since it uses as much as digits as its factorization.

91014921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6608 (or 6593 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 27.

The square root of 91014921 is about 9540.1740550160. The cubic root of 91014921 is about 449.8187269878.

The spelling of 91014921 in words is "ninety-one million, fourteen thousand, nine hundred twenty-one".