91867499 has 2 divisors, whose sum is σ = 91867500. Its totient is φ = 91867498.

The previous prime is 91867487. The next prime is 91867547. The reversal of 91867499 is 99476819.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91867499 - 2⁴ = 91867483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91867499.

It is not a weakly prime, because it can be changed into another prime (91861499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45933749 + 45933750.

It is an arithmetic number, because the mean of its divisors is an integer number (45933750).

Almost surely, 2^91867499 is an apocalyptic number.

91867499 is a deficient number, since it is larger than the sum of its proper divisors (1).

91867499 is an equidigital number, since it uses as much as digits as its factorization.

91867499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 979776, while the sum is 53.

The square root of 91867499 is about 9584.7534657914. The cubic root of 91867499 is about 451.2189159150.

The spelling of 91867499 in words is "ninety-one million, eight hundred sixty-seven thousand, four hundred ninety-nine".