91404382379 has 2 divisors, whose sum is σ = 91404382380. Its totient is φ = 91404382378.

The previous prime is 91404382369. The next prime is 91404382397. The reversal of 91404382379 is 97328340419.

Together with next prime (91404382397) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91404382379 - 2³⁶ = 22684905643 is a prime.

It is a super-2 number, since 2×91404382379² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91404382309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45702191189 + 45702191190.

It is an arithmetic number, because the mean of its divisors is an integer number (45702191190).

Almost surely, 2^91404382379 is an apocalyptic number.

91404382379 is a deficient number, since it is larger than the sum of its proper divisors (1).

91404382379 is an equidigital number, since it uses as much as digits as its factorization.

91404382379 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 91404382379 in words is "ninety-one billion, four hundred four million, three hundred eighty-two thousand, three hundred seventy-nine".