91966839 has 8 divisors (see below), whose sum is σ = 122715120. Its totient is φ = 61264896.

The previous prime is 91966837. The next prime is 91966841. The reversal of 91966839 is 93866919.

It is an interprime number because it is at equal distance from previous prime (91966837) and next prime (91966841).

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

It is not a de Polignac number, because 91966839 - 2¹ = 91966837 is a prime.

It is a super-3 number, since 3×91966839³ (a number of 25 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91966791 and 91966800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91966837) 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, 6652 + ... + 15105.

It is an arithmetic number, because the mean of its divisors is an integer number (15339390).

Almost surely, 2^91966839 is an apocalyptic number.

91966839 is a deficient number, since it is larger than the sum of its proper divisors (30748281).

91966839 is a wasteful number, since it uses less digits than its factorization.

91966839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23169.

The product of its digits is 629856, while the sum is 51.

The square root of 91966839 is about 9589.9342542063. The cubic root of 91966839 is about 451.3814976790.

The spelling of 91966839 in words is "ninety-one million, nine hundred sixty-six thousand, eight hundred thirty-nine".