91967381 has 12 divisors (see below), whose sum is σ = 104577900. Its totient is φ = 80720640.

The previous prime is 91967377. The next prime is 91967383. The reversal of 91967381 is 18376919.

It can be written as a sum of positive squares in 2 ways, for example, as 40844881 + 51122500 = 6391^2 + 7150^2 .

It is not a de Polignac number, because 91967381 - 2² = 91967377 is a prime.

It is a super-3 number, since 3×91967381³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91967383) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9596 + ... + 16613.

It is an arithmetic number, because the mean of its divisors is an integer number (8714825).

Almost surely, 2^91967381 is an apocalyptic number.

It is an amenable number.

91967381 is a deficient number, since it is larger than the sum of its proper divisors (12610519).

91967381 is a wasteful number, since it uses less digits than its factorization.

91967381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26260 (or 26249 counting only the distinct ones).

The product of its digits is 81648, while the sum is 44.

The square root of 91967381 is about 9589.9625129611. The cubic root of 91967381 is about 451.3823844055.

The spelling of 91967381 in words is "ninety-one million, nine hundred sixty-seven thousand, three hundred eighty-one".