91868291 has 2 divisors, whose sum is σ = 91868292. Its totient is φ = 91868290.

The previous prime is 91868261. The next prime is 91868321. The reversal of 91868291 is 19286819.

It is a balanced prime because it is at equal distance from previous prime (91868261) and next prime (91868321).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91868291 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91868261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45934145 + 45934146.

It is an arithmetic number, because the mean of its divisors is an integer number (45934146).

Almost surely, 2^91868291 is an apocalyptic number.

91868291 is a deficient number, since it is larger than the sum of its proper divisors (1).

91868291 is an equidigital number, since it uses as much as digits as its factorization.

91868291 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 91868291 is about 9584.7947813190. The cubic root of 91868291 is about 451.2202125809.

The spelling of 91868291 in words is "ninety-one million, eight hundred sixty-eight thousand, two hundred ninety-one".