91689243 has 16 divisors (see below), whose sum is σ = 125798400. Its totient is φ = 59366720.

The previous prime is 91689239. The next prime is 91689251. The reversal of 91689243 is 34298619.

It is a cyclic number.

It is not a de Polignac number, because 91689243 - 2² = 91689239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91689195 and 91689204.

It is not an unprimeable number, because it can be changed into a prime (91689203) 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, 27838 + ... + 30956.

It is an arithmetic number, because the mean of its divisors is an integer number (7862400).

Almost surely, 2^91689243 is an apocalyptic number.

91689243 is a deficient number, since it is larger than the sum of its proper divisors (34109157).

91689243 is a wasteful number, since it uses less digits than its factorization.

91689243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402.

The product of its digits is 93312, while the sum is 42.

The square root of 91689243 is about 9575.4500155345. The cubic root of 91689243 is about 450.9268846063.

The spelling of 91689243 in words is "ninety-one million, six hundred eighty-nine thousand, two hundred forty-three".