91361381 has 2 divisors, whose sum is σ = 91361382. Its totient is φ = 91361380.

The previous prime is 91361377. The next prime is 91361419. The reversal of 91361381 is 18316319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 73805281 + 17556100 = 8591^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 91361381 - 2² = 91361377 is a prime.

It is a super-2 number, since 2×91361381² = 16693803876454322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91361321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45680690 + 45680691.

It is an arithmetic number, because the mean of its divisors is an integer number (45680691).

Almost surely, 2^91361381 is an apocalyptic number.

It is an amenable number.

91361381 is a deficient number, since it is larger than the sum of its proper divisors (1).

91361381 is an equidigital number, since it uses as much as digits as its factorization.

91361381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 91361381 is about 9558.3147573199. The cubic root of 91361381 is about 450.3887685612.

The spelling of 91361381 in words is "ninety-one million, three hundred sixty-one thousand, three hundred eighty-one".