91233893381 has 2 divisors, whose sum is σ = 91233893382. Its totient is φ = 91233893380.

The previous prime is 91233893371. The next prime is 91233893407. The reversal of 91233893381 is 18339833219.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46573524481 + 44660368900 = 215809^2 + 211330^2 .

It is a cyclic number.

It is not a de Polignac number, because 91233893381 - 2¹⁰ = 91233892357 is a prime.

It is a super-2 number, since 2×91233893381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91233893371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45616946690 + 45616946691.

It is an arithmetic number, because the mean of its divisors is an integer number (45616946691).

Almost surely, 2^91233893381 is an apocalyptic number.

It is an amenable number.

91233893381 is a deficient number, since it is larger than the sum of its proper divisors (1).

91233893381 is an equidigital number, since it uses as much as digits as its factorization.

91233893381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 839808, while the sum is 50.

The spelling of 91233893381 in words is "ninety-one billion, two hundred thirty-three million, eight hundred ninety-three thousand, three hundred eighty-one".