1311223012 has 12 divisors (see below), whose sum is σ = 2503244016. Its totient is φ = 596010440.

The previous prime is 1311222977. The next prime is 1311223013. The reversal of 1311223012 is 2103221131.

It is not an unprimeable number, because it can be changed into a prime (1311223013) 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, 14900218 + ... + 14900305.

It is an arithmetic number, because the mean of its divisors is an integer number (208603668).

Almost surely, 2^1311223012 is an apocalyptic number.

It is an amenable number.

1311223012 is a deficient number, since it is larger than the sum of its proper divisors (1192021004).

1311223012 is a wasteful number, since it uses less digits than its factorization.

1311223012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29800538 (or 29800536 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 1311223012 is about 36210.8134678027. The cubic root of 1311223012 is about 1094.5245844560.

Adding to 1311223012 its reverse (2103221131), we get a palindrome (3414444143).

The spelling of 1311223012 in words is "one billion, three hundred eleven million, two hundred twenty-three thousand, twelve".