91170427 has 2 divisors, whose sum is σ = 91170428. Its totient is φ = 91170426.

The previous prime is 91170421. The next prime is 91170463. The reversal of 91170427 is 72407119.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91170427 is a prime.

It is not a weakly prime, because it can be changed into another prime (91170421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45585213 + 45585214.

It is an arithmetic number, because the mean of its divisors is an integer number (45585214).

Almost surely, 2^91170427 is an apocalyptic number.

91170427 is a deficient number, since it is larger than the sum of its proper divisors (1).

91170427 is an equidigital number, since it uses as much as digits as its factorization.

91170427 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 91170427 is about 9548.3206376828. The cubic root of 91170427 is about 450.0747645324.

The spelling of 91170427 in words is "ninety-one million, one hundred seventy thousand, four hundred twenty-seven".