231929 has 4 divisors (see below), whose sum is σ = 235920. Its totient is φ = 227940.

The previous prime is 231923. The next prime is 231943. The reversal of 231929 is 929132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231929 - 2¹⁶ = 166393 is a prime.

It is a super-2 number, since 2×231929² = 107582122082, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 231898 and 231907.

It is not an unprimeable number, because it can be changed into a prime (231923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1907 + ... + 2024.

It is an arithmetic number, because the mean of its divisors is an integer number (58980).

2²³¹⁹²⁹ is an apocalyptic number.

It is an amenable number.

231929 is a deficient number, since it is larger than the sum of its proper divisors (3991).

231929 is an equidigital number, since it uses as much as digits as its factorization.

231929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990.

The product of its digits is 972, while the sum is 26.

The square root of 231929 is about 481.5900746486. The cubic root of 231929 is about 61.4400676416.

The spelling of 231929 in words is "two hundred thirty-one thousand, nine hundred twenty-nine".