91973609839 has 2 divisors, whose sum is σ = 91973609840. Its totient is φ = 91973609838.

The previous prime is 91973609821. The next prime is 91973609879. The reversal of 91973609839 is 93890637919.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91973609839 - 2²⁵ = 91940055407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91973609879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45986804919 + 45986804920.

It is an arithmetic number, because the mean of its divisors is an integer number (45986804920).

Almost surely, 2^91973609839 is an apocalyptic number.

91973609839 is a deficient number, since it is larger than the sum of its proper divisors (1).

91973609839 is an equidigital number, since it uses as much as digits as its factorization.

91973609839 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 19840464, while the sum is 64.

The spelling of 91973609839 in words is "ninety-one billion, nine hundred seventy-three million, six hundred nine thousand, eight hundred thirty-nine".