1213291868 has 6 divisors (see below), whose sum is σ = 2123260776. Its totient is φ = 606645932.

The previous prime is 1213291867. The next prime is 1213291889. The reversal of 1213291868 is 8681923121.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213291861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151661480 + ... + 151661487.

It is an arithmetic number, because the mean of its divisors is an integer number (353876796).

Almost surely, 2^1213291868 is an apocalyptic number.

It is an amenable number.

1213291868 is a deficient number, since it is larger than the sum of its proper divisors (909968908).

1213291868 is a wasteful number, since it uses less digits than its factorization.

1213291868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303322971 (or 303322969 counting only the distinct ones).

The product of its digits is 41472, while the sum is 41.

The square root of 1213291868 is about 34832.3393988977. The cubic root of 1213291868 is about 1066.5677038830.

The spelling of 1213291868 in words is "one billion, two hundred thirteen million, two hundred ninety-one thousand, eight hundred sixty-eight".