231977 has 4 divisors (see below), whose sum is σ = 233220. Its totient is φ = 230736.

The previous prime is 231967. The next prime is 232003. The reversal of 231977 is 779132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 90601 + 141376 = 301^2 + 376^2 .

It is a cyclic number.

It is not a de Polignac number, because 231977 - 2⁴ = 231961 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 231977.

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 3 ways as a sum of consecutive naturals, for example, 278 + ... + 735.

It is an arithmetic number, because the mean of its divisors is an integer number (58305).

2²³¹⁹⁷⁷ is an apocalyptic number.

It is an amenable number.

231977 is a deficient number, since it is larger than the sum of its proper divisors (1243).

231977 is a wasteful number, since it uses less digits than its factorization.

231977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242.

The product of its digits is 2646, while the sum is 29.

The square root of 231977 is about 481.6399069845. The cubic root of 231977 is about 61.4443058924. Note that the first 3 decimals are identical.

The spelling of 231977 in words is "two hundred thirty-one thousand, nine hundred seventy-seven".