91798939 has 2 divisors, whose sum is σ = 91798940. Its totient is φ = 91798938.

The previous prime is 91798909. The next prime is 91798981. The reversal of 91798939 is 93989719.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91798939 - 2⁵ = 91798907 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91798939.

It is not a weakly prime, because it can be changed into another prime (91798909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45899469 + 45899470.

It is an arithmetic number, because the mean of its divisors is an integer number (45899470).

Almost surely, 2^91798939 is an apocalyptic number.

91798939 is a deficient number, since it is larger than the sum of its proper divisors (1).

91798939 is an equidigital number, since it uses as much as digits as its factorization.

91798939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 55.

The square root of 91798939 is about 9581.1762847784. The cubic root of 91798939 is about 451.1066409246.

It can be divided in two parts, 917 and 98939, that added together give a square (99856 = 316²).

The spelling of 91798939 in words is "ninety-one million, seven hundred ninety-eight thousand, nine hundred thirty-nine".