91939261 has 8 divisors (see below), whose sum is σ = 95728248. Its totient is φ = 88224000.

The previous prime is 91939229. The next prime is 91939283. The reversal of 91939261 is 16293919.

It can be written as a sum of positive squares in 4 ways, for example, as 25190361 + 66748900 = 5019^2 + 8170^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91939261 - 2⁵ = 91939229 is a prime.

It is a super-2 number, since 2×91939261² = 16905655426452242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91939201) 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 7 ways as a sum of consecutive naturals, for example, 15880 + ... + 20881.

It is an arithmetic number, because the mean of its divisors is an integer number (11966031).

Almost surely, 2^91939261 is an apocalyptic number.

It is an amenable number.

91939261 is a deficient number, since it is larger than the sum of its proper divisors (3788987).

91939261 is a wasteful number, since it uses less digits than its factorization.

91939261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36863.

The product of its digits is 26244, while the sum is 40.

The square root of 91939261 is about 9588.4962846111. The cubic root of 91939261 is about 451.3363747355.

The spelling of 91939261 in words is "ninety-one million, nine hundred thirty-nine thousand, two hundred sixty-one".