1204311331 has 4 divisors (see below), whose sum is σ = 1275153192. Its totient is φ = 1133469472.

The previous prime is 1204311323. The next prime is 1204311341. The reversal of 1204311331 is 1331134021.

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

It is a cyclic number.

It is not a de Polignac number, because 1204311331 - 2³ = 1204311323 is a prime.

It is a super-2 number, since 2×1204311331² = 2900731563949983122, 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 = 1204311299 and 1204311308.

It is not an unprimeable number, because it can be changed into a prime (1204311341) 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, 35420905 + ... + 35420938.

It is an arithmetic number, because the mean of its divisors is an integer number (318788298).

Almost surely, 2^1204311331 is an apocalyptic number.

1204311331 is a deficient number, since it is larger than the sum of its proper divisors (70841861).

1204311331 is an equidigital number, since it uses as much as digits as its factorization.

1204311331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70841860.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1204311331 is about 34703.1890609494. The cubic root of 1204311331 is about 1063.9296794665.

Adding to 1204311331 its reverse (1331134021), we get a palindrome (2535445352).

The spelling of 1204311331 in words is "one billion, two hundred four million, three hundred eleven thousand, three hundred thirty-one".