91684541 has 8 divisors (see below), whose sum is σ = 100600920. Its totient is φ = 83034432.

The previous prime is 91684531. The next prime is 91684543. The reversal of 91684541 is 14548619.

It can be written as a sum of positive squares in 4 ways, for example, as 27604516 + 64080025 = 5254^2 + 8005^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-91684541 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 91684495 and 91684504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91684543) 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, 65846 + ... + 67223.

It is an arithmetic number, because the mean of its divisors is an integer number (12575115).

Almost surely, 2^91684541 is an apocalyptic number.

It is an amenable number.

91684541 is a deficient number, since it is larger than the sum of its proper divisors (8916379).

91684541 is a wasteful number, since it uses less digits than its factorization.

91684541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133135.

The product of its digits is 34560, while the sum is 38.

The square root of 91684541 is about 9575.2044886780. The cubic root of 91684541 is about 450.9191763431.

The spelling of 91684541 in words is "ninety-one million, six hundred eighty-four thousand, five hundred forty-one".