1231332331 has 4 divisors (see below), whose sum is σ = 1231848000. Its totient is φ = 1230816664.

The previous prime is 1231332281. The next prime is 1231332337. The reversal of 1231332331 is 1332331321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1332331321 = 6359 ⋅209519.

It is a cyclic number.

It is not a de Polignac number, because 1231332331 - 2⁷ = 1231332203 is a prime.

It is a super-2 number, since 2×1231332331² = 3032358618731787122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1231332337) 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, 254236 + ... + 259033.

It is an arithmetic number, because the mean of its divisors is an integer number (307962000).

Almost surely, 2^1231332331 is an apocalyptic number.

1231332331 is a deficient number, since it is larger than the sum of its proper divisors (515669).

1231332331 is an equidigital number, since it uses as much as digits as its factorization.

1231332331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515668.

The product of its digits is 972, while the sum is 22.

The square root of 1231332331 is about 35090.3452676089. The cubic root of 1231332331 is about 1071.8279903689.

Adding to 1231332331 its reverse (1332331321), we get a palindrome (2563663652).

It can be divided in two parts, 12313 and 32331, that added together give a palindrome (44644).

The spelling of 1231332331 in words is "one billion, two hundred thirty-one million, three hundred thirty-two thousand, three hundred thirty-one".