91899271 has 2 divisors, whose sum is σ = 91899272. Its totient is φ = 91899270.

The previous prime is 91899259. The next prime is 91899281. The reversal of 91899271 is 17299819.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (17299819) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91899271 - 2⁹ = 91898759 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91899211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45949635 + 45949636.

It is an arithmetic number, because the mean of its divisors is an integer number (45949636).

Almost surely, 2^91899271 is an apocalyptic number.

91899271 is a deficient number, since it is larger than the sum of its proper divisors (1).

91899271 is an equidigital number, since it uses as much as digits as its factorization.

91899271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 46.

The square root of 91899271 is about 9586.4107464681. The cubic root of 91899271 is about 451.2709273270.

The spelling of 91899271 in words is "ninety-one million, eight hundred ninety-nine thousand, two hundred seventy-one".