91671943 has 16 divisors (see below), whose sum is σ = 102057120. Its totient is φ = 81648000.

The previous prime is 91671919. The next prime is 91671947. The reversal of 91671943 is 34917619.

It is a cyclic number.

It is not a de Polignac number, because 91671943 - 2⁵ = 91671911 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91671896 and 91671905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91671947) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120721 + ... + 121477.

It is an arithmetic number, because the mean of its divisors is an integer number (6378570).

Almost surely, 2^91671943 is an apocalyptic number.

91671943 is a deficient number, since it is larger than the sum of its proper divisors (10385177).

91671943 is a wasteful number, since it uses less digits than its factorization.

91671943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 978.

The product of its digits is 40824, while the sum is 40.

The square root of 91671943 is about 9574.5466211200. The cubic root of 91671943 is about 450.8985224069.

The spelling of 91671943 in words is "ninety-one million, six hundred seventy-one thousand, nine hundred forty-three".