91999067 has 2 divisors, whose sum is σ = 91999068. Its totient is φ = 91999066.

The previous prime is 91999051. The next prime is 91999079. The reversal of 91999067 is 76099919.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91999067 - 2⁴ = 91999051 is a prime.

It is not a weakly prime, because it can be changed into another prime (91999027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45999533 + 45999534.

It is an arithmetic number, because the mean of its divisors is an integer number (45999534).

Almost surely, 2^91999067 is an apocalyptic number.

91999067 is a deficient number, since it is larger than the sum of its proper divisors (1).

91999067 is an equidigital number, since it uses as much as digits as its factorization.

91999067 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 275562, while the sum is 50.

The square root of 91999067 is about 9591.6144105151. The cubic root of 91999067 is about 451.4342174932.

The spelling of 91999067 in words is "ninety-one million, nine hundred ninety-nine thousand, sixty-seven".