91869281 has 8 divisors (see below), whose sum is σ = 105544704. Its totient is φ = 78331680.

The previous prime is 91869277. The next prime is 91869287. The reversal of 91869281 is 18296819.

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

It is not a de Polignac number, because 91869281 - 2² = 91869277 is a prime.

It is a super-2 number, since 2×91869281² = 16879929582913922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91869287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33020 + ... + 35693.

It is an arithmetic number, because the mean of its divisors is an integer number (13193088).

Almost surely, 2^91869281 is an apocalyptic number.

It is an amenable number.

91869281 is a deficient number, since it is larger than the sum of its proper divisors (13675423).

91869281 is a wasteful number, since it uses less digits than its factorization.

91869281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68911.

The product of its digits is 62208, while the sum is 44.

The square root of 91869281 is about 9584.8464254781. The cubic root of 91869281 is about 451.2218334028.

The spelling of 91869281 in words is "ninety-one million, eight hundred sixty-nine thousand, two hundred eighty-one".