91327289 has 2 divisors, whose sum is σ = 91327290. Its totient is φ = 91327288.

The previous prime is 91327283. The next prime is 91327361. The reversal of 91327289 is 98272319.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71149225 + 20178064 = 8435^2 + 4492^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91327289 is a prime.

It is not a weakly prime, because it can be changed into another prime (91327283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45663644 + 45663645.

It is an arithmetic number, because the mean of its divisors is an integer number (45663645).

Almost surely, 2^91327289 is an apocalyptic number.

It is an amenable number.

91327289 is a deficient number, since it is larger than the sum of its proper divisors (1).

91327289 is an equidigital number, since it uses as much as digits as its factorization.

91327289 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 41.

The square root of 91327289 is about 9556.5312221538. The cubic root of 91327289 is about 450.3327399124.

The spelling of 91327289 in words is "ninety-one million, three hundred twenty-seven thousand, two hundred eighty-nine".