91198379 has 2 divisors, whose sum is σ = 91198380. Its totient is φ = 91198378.

The previous prime is 91198369. The next prime is 91198409. The reversal of 91198379 is 97389119.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (97389119) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91198379 - 2⁸ = 91198123 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91198339) 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, 45599189 + 45599190.

It is an arithmetic number, because the mean of its divisors is an integer number (45599190).

Almost surely, 2^91198379 is an apocalyptic number.

91198379 is a deficient number, since it is larger than the sum of its proper divisors (1).

91198379 is an equidigital number, since it uses as much as digits as its factorization.

91198379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 122472, while the sum is 47.

The square root of 91198379 is about 9549.7842384004. The cubic root of 91198379 is about 450.1207560700.

The spelling of 91198379 in words is "ninety-one million, one hundred ninety-eight thousand, three hundred seventy-nine".