1213409783 has 4 divisors (see below), whose sum is σ = 1246204680. Its totient is φ = 1180614888.

The previous prime is 1213409779. The next prime is 1213409797. The reversal of 1213409783 is 3879043121.

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 1213409783 - 2² = 1213409779 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213439783) 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, 16397393 + ... + 16397466.

It is an arithmetic number, because the mean of its divisors is an integer number (311551170).

Almost surely, 2^1213409783 is an apocalyptic number.

1213409783 is a deficient number, since it is larger than the sum of its proper divisors (32794897).

1213409783 is an equidigital number, since it uses as much as digits as its factorization.

1213409783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32794896.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 1213409783 is about 34834.0319658807. The cubic root of 1213409783 is about 1066.6022545849.

The spelling of 1213409783 in words is "one billion, two hundred thirteen million, four hundred nine thousand, seven hundred eighty-three".