1231330331 has 8 divisors (see below), whose sum is σ = 1535165184. Its totient is φ = 959478120.

The previous prime is 1231330307. The next prime is 1231330337. The reversal of 1231330331 is 1330331321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231330331 - 2⁶ = 1231330267 is a prime.

It is a super-2 number, since 2×1231330331² = 3032348768081139122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231330337) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7995575 + ... + 7995728.

It is an arithmetic number, because the mean of its divisors is an integer number (191895648).

Almost surely, 2^1231330331 is an apocalyptic number.

1231330331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1231330331 is a deficient number, since it is larger than the sum of its proper divisors (303834853).

1231330331 is a wasteful number, since it uses less digits than its factorization.

1231330331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15991321.

The product of its (nonzero) digits is 486, while the sum is 20.

The square root of 1231330331 is about 35090.3167697301. The cubic root of 1231330331 is about 1071.8274100606.

Adding to 1231330331 its reverse (1330331321), we get a palindrome (2561661652).

The spelling of 1231330331 in words is "one billion, two hundred thirty-one million, three hundred thirty thousand, three hundred thirty-one".