91726291 has 2 divisors, whose sum is σ = 91726292. Its totient is φ = 91726290.

The previous prime is 91726289. The next prime is 91726351. The reversal of 91726291 is 19262719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91726291 - 2¹ = 91726289 is a prime.

Together with 91726289, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 91726291.

It is not a weakly prime, because it can be changed into another prime (91726211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45863145 + 45863146.

It is an arithmetic number, because the mean of its divisors is an integer number (45863146).

Almost surely, 2^91726291 is an apocalyptic number.

91726291 is a deficient number, since it is larger than the sum of its proper divisors (1).

91726291 is an equidigital number, since it uses as much as digits as its factorization.

91726291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 37.

The square root of 91726291 is about 9577.3843506461. The cubic root of 91726291 is about 450.9876103400.

The spelling of 91726291 in words is "ninety-one million, seven hundred twenty-six thousand, two hundred ninety-one".