1213306509 has 8 divisors (see below), whose sum is σ = 1624037760. Its totient is φ = 805723136.

The previous prime is 1213306499. The next prime is 1213306513. The reversal of 1213306509 is 9056033121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213306509 - 2²⁰ = 1212257933 is a prime.

It is a super-2 number, since 2×1213306509² = 2944225369563534162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213306529) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 786069 + ... + 787610.

It is an arithmetic number, because the mean of its divisors is an integer number (203004720).

Almost surely, 2^1213306509 is an apocalyptic number.

It is an amenable number.

1213306509 is a deficient number, since it is larger than the sum of its proper divisors (410731251).

1213306509 is a wasteful number, since it uses less digits than its factorization.

1213306509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1573939.

The product of its (nonzero) digits is 4860, while the sum is 30.

The square root of 1213306509 is about 34832.5495621552. The cubic root of 1213306509 is about 1066.5719940172.

The spelling of 1213306509 in words is "one billion, two hundred thirteen million, three hundred six thousand, five hundred nine".