91971044 has 12 divisors (see below), whose sum is σ = 175581168. Its totient is φ = 41805000.

The previous prime is 91971041. The next prime is 91971049. The reversal of 91971044 is 44017919.

It is a super-3 number, since 3×91971044³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91970995 and 91971013.

It is not an unprimeable number, because it can be changed into a prime (91971041) 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 3 ways as a sum of consecutive naturals, for example, 1045082 + ... + 1045169.

It is an arithmetic number, because the mean of its divisors is an integer number (14631764).

Almost surely, 2^91971044 is an apocalyptic number.

It is an amenable number.

91971044 is a deficient number, since it is larger than the sum of its proper divisors (83610124).

91971044 is a wasteful number, since it uses less digits than its factorization.

91971044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2090266 (or 2090264 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 91971044 is about 9590.1534919938. The cubic root of 91971044 is about 451.3883770799.

The spelling of 91971044 in words is "ninety-one million, nine hundred seventy-one thousand, forty-four".