231212331 has 72 divisors (see below), whose sum is σ = 408142800. Its totient is φ = 125596800.

The previous prime is 231212321. The next prime is 231212339. The reversal of 231212331 is 133212132.

231212331 = T₃₄₃ + T₃₄₄ + ... + T₁₁₂₅.

It is not a de Polignac number, because 231212331 - 2¹⁴ = 231195947 is a prime.

It is a super-2 number, since 2×231212331² = 106918284012907122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (231212339) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1291600 + ... + 1291778.

It is an arithmetic number, because the mean of its divisors is an integer number (5668650).

Almost surely, 2^231212331 is an apocalyptic number.

231212331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231212331 is a deficient number, since it is larger than the sum of its proper divisors (176930469).

231212331 is a wasteful number, since it uses less digits than its factorization.

231212331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329 (or 319 counting only the distinct ones).

The product of its digits is 216, while the sum is 18.

The square root of 231212331 is about 15205.6677262131. The cubic root of 231212331 is about 613.7671833562.

Adding to 231212331 its reverse (133212132), we get a palindrome (364424463).

It can be divided in two parts, 23121 and 2331, that added together give a palindrome (25452).

The spelling of 231212331 in words is "two hundred thirty-one million, two hundred twelve thousand, three hundred thirty-one".