231143331 has 16 divisors (see below), whose sum is σ = 313030656. Its totient is φ = 151684416.

The previous prime is 231143327. The next prime is 231143333. The reversal of 231143331 is 133341132.

It is not a de Polignac number, because 231143331 - 2² = 231143327 is a prime.

It is a super-2 number, since 2×231143331² = 106854478931551122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 231143298 and 231143307.

It is not an unprimeable number, because it can be changed into a prime (231143333) 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, 188386 + ... + 189608.

It is an arithmetic number, because the mean of its divisors is an integer number (19564416).

Almost surely, 2^231143331 is an apocalyptic number.

231143331 is a deficient number, since it is larger than the sum of its proper divisors (81887325).

231143331 is a wasteful number, since it uses less digits than its factorization.

231143331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162.

The product of its digits is 648, while the sum is 21.

The square root of 231143331 is about 15203.3986660878. The cubic root of 231143331 is about 613.7061223840.

Adding to 231143331 its reverse (133341132), we get a palindrome (364484463).

The spelling of 231143331 in words is "two hundred thirty-one million, one hundred forty-three thousand, three hundred thirty-one".