91989367 has 2 divisors, whose sum is σ = 91989368. Its totient is φ = 91989366.

The previous prime is 91989361. The next prime is 91989371. The reversal of 91989367 is 76398919.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91989367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91989361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45994683 + 45994684.

It is an arithmetic number, because the mean of its divisors is an integer number (45994684).

Almost surely, 2^91989367 is an apocalyptic number.

91989367 is a deficient number, since it is larger than the sum of its proper divisors (1).

91989367 is an equidigital number, since it uses as much as digits as its factorization.

91989367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 734832, while the sum is 52.

The square root of 91989367 is about 9591.1087471679. The cubic root of 91989367 is about 451.4183511518.

The spelling of 91989367 in words is "ninety-one million, nine hundred eighty-nine thousand, three hundred sixty-seven".