91191379 has 2 divisors, whose sum is σ = 91191380. Its totient is φ = 91191378.

The previous prime is 91191377. The next prime is 91191439. The reversal of 91191379 is 97319119.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91191379 - 2¹ = 91191377 is a prime.

Together with 91191377, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (91191377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45595689 + 45595690.

It is an arithmetic number, because the mean of its divisors is an integer number (45595690).

Almost surely, 2^91191379 is an apocalyptic number.

91191379 is a deficient number, since it is larger than the sum of its proper divisors (1).

91191379 is an equidigital number, since it uses as much as digits as its factorization.

91191379 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15309, while the sum is 40.

The square root of 91191379 is about 9549.4177309405. The cubic root of 91191379 is about 450.1092393232.

The spelling of 91191379 in words is "ninety-one million, one hundred ninety-one thousand, three hundred seventy-nine".