91721327 has 2 divisors, whose sum is σ = 91721328. Its totient is φ = 91721326.

The previous prime is 91721321. The next prime is 91721347. The reversal of 91721327 is 72312719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91721327 - 2¹⁰ = 91720303 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91721293 and 91721302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91721321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45860663 + 45860664.

It is an arithmetic number, because the mean of its divisors is an integer number (45860664).

Almost surely, 2^91721327 is an apocalyptic number.

91721327 is a deficient number, since it is larger than the sum of its proper divisors (1).

91721327 is an equidigital number, since it uses as much as digits as its factorization.

91721327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5292, while the sum is 32.

The square root of 91721327 is about 9577.1251949633. The cubic root of 91721327 is about 450.9794747486.

The spelling of 91721327 in words is "ninety-one million, seven hundred twenty-one thousand, three hundred twenty-seven".