91238881 has 8 divisors (see below), whose sum is σ = 97248384. Its totient is φ = 85300800.

The previous prime is 91238869. The next prime is 91238887. The reversal of 91238881 is 18883219.

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 91238881 - 2⁷ = 91238753 is a prime.

It is a super-3 number, since 3×91238881³ (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 not an unprimeable number, because it can be changed into a prime (91238887) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15205 + ... + 20338.

It is an arithmetic number, because the mean of its divisors is an integer number (12156048).

Almost surely, 2^91238881 is an apocalyptic number.

It is an amenable number.

91238881 is a deficient number, since it is larger than the sum of its proper divisors (6009503).

91238881 is a wasteful number, since it uses less digits than its factorization.

91238881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35711.

The product of its digits is 27648, while the sum is 40.

The square root of 91238881 is about 9551.9045744815. The cubic root of 91238881 is about 450.1873804000.

It can be divided in two parts, 912 and 38881, that added together give a palindrome (39793).

The spelling of 91238881 in words is "ninety-one million, two hundred thirty-eight thousand, eight hundred eighty-one".