231891983 has 8 divisors (see below), whose sum is σ = 235790352. Its totient is φ = 228024576.

The previous prime is 231891953. The next prime is 231892021. The reversal of 231891983 is 389198132.

231891983 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 15228²-1.

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

It is a cyclic number.

It is not a de Polignac number, because 231891983 - 2¹⁴ = 231875599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231891943) 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, 7616 + ... + 22842.

It is an arithmetic number, because the mean of its divisors is an integer number (29473794).

Almost surely, 2^231891983 is an apocalyptic number.

231891983 is a deficient number, since it is larger than the sum of its proper divisors (3898369).

231891983 is a wasteful number, since it uses less digits than its factorization.

231891983 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15481.

The product of its digits is 93312, while the sum is 44.

The square root of 231891983 is about 15227.9999671657. Note that the first 4 decimals coincide. The cubic root of 231891983 is about 614.3679875613.

The spelling of 231891983 in words is "two hundred thirty-one million, eight hundred ninety-one thousand, nine hundred eighty-three".