1230431331 has 4 divisors (see below), whose sum is σ = 1640575112. Its totient is φ = 820287552.

The previous prime is 1230431281. The next prime is 1230431339. The reversal of 1230431331 is 1331340321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1230431331 - 2¹¹ = 1230429283 is a prime.

It is a super-2 number, since 2×1230431331² = 3027922520612863122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1230431298 and 1230431307.

It is not an unprimeable number, because it can be changed into a prime (1230431339) 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, 205071886 + ... + 205071891.

It is an arithmetic number, because the mean of its divisors is an integer number (410143778).

Almost surely, 2^1230431331 is an apocalyptic number.

1230431331 is a deficient number, since it is larger than the sum of its proper divisors (410143781).

1230431331 is an equidigital number, since it uses as much as digits as its factorization.

1230431331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 410143780.

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

The square root of 1230431331 is about 35077.5046290354. The cubic root of 1230431331 is about 1071.5664978273.

Adding to 1230431331 its reverse (1331340321), we get a palindrome (2561771652).

The spelling of 1230431331 in words is "one billion, two hundred thirty million, four hundred thirty-one thousand, three hundred thirty-one".