91881017 has 4 divisors (see below), whose sum is σ = 96716880. Its totient is φ = 87045156.

The previous prime is 91881001. The next prime is 91881059. The reversal of 91881017 is 71018819.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91881017 - 2⁴ = 91881001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91881917) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2417903 + ... + 2417940.

It is an arithmetic number, because the mean of its divisors is an integer number (24179220).

Almost surely, 2^91881017 is an apocalyptic number.

It is an amenable number.

91881017 is a deficient number, since it is larger than the sum of its proper divisors (4835863).

91881017 is a wasteful number, since it uses less digits than its factorization.

91881017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4835862.

The product of its (nonzero) digits is 4032, while the sum is 35.

The square root of 91881017 is about 9585.4586223091. The cubic root of 91881017 is about 451.2410466222.

The spelling of 91881017 in words is "ninety-one million, eight hundred eighty-one thousand, seventeen".