91481121839 has 2 divisors, whose sum is σ = 91481121840. Its totient is φ = 91481121838.

The previous prime is 91481121829. The next prime is 91481121841. The reversal of 91481121839 is 93812118419.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91481121839 - 2⁸ = 91481121583 is a prime.

Together with 91481121841, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 91481121793 and 91481121802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91481121829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45740560919 + 45740560920.

It is an arithmetic number, because the mean of its divisors is an integer number (45740560920).

Almost surely, 2^91481121839 is an apocalyptic number.

91481121839 is a deficient number, since it is larger than the sum of its proper divisors (1).

91481121839 is an equidigital number, since it uses as much as digits as its factorization.

91481121839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 124416, while the sum is 47.

The spelling of 91481121839 in words is "ninety-one billion, four hundred eighty-one million, one hundred twenty-one thousand, eight hundred thirty-nine".