231987 has 8 divisors (see below), whose sum is σ = 353536. Its totient is φ = 132552.

The previous prime is 231967. The next prime is 232003. The reversal of 231987 is 789132.

It is a happy number.

231987 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 231987 - 2⁶ = 231923 is a prime.

It is a Duffinian number.

231987 is strictly pandigital in base 7.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231987.

It is not an unprimeable number, because it can be changed into a prime (231947) 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, 5503 + ... + 5544.

It is an arithmetic number, because the mean of its divisors is an integer number (44192).

2²³¹⁹⁸⁷ is an apocalyptic number.

231987 is a deficient number, since it is larger than the sum of its proper divisors (121549).

231987 is a wasteful number, since it uses less digits than its factorization.

231987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11057.

The product of its digits is 3024, while the sum is 30.

The square root of 231987 is about 481.6502880722. The cubic root of 231987 is about 61.4451887877.

The spelling of 231987 in words is "two hundred thirty-one thousand, nine hundred eighty-seven".