1213668009 has 32 divisors (see below), whose sum is σ = 1865721600. Its totient is φ = 778821120.

The previous prime is 1213667989. The next prime is 1213668031. The reversal of 1213668009 is 9008663121.

It is not a de Polignac number, because 1213668009 - 2⁷ = 1213667881 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1213668109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274204 + ... + 278594.

It is an arithmetic number, because the mean of its divisors is an integer number (58303800).

Almost surely, 2^1213668009 is an apocalyptic number.

It is an amenable number.

1213668009 is a deficient number, since it is larger than the sum of its proper divisors (652053591).

1213668009 is a wasteful number, since it uses less digits than its factorization.

1213668009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4782 (or 4776 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 1213668009 is about 34837.7382876673. The cubic root of 1213668009 is about 1066.6779105043.

The spelling of 1213668009 in words is "one billion, two hundred thirteen million, six hundred sixty-eight thousand, nine".