1212322309 has 16 divisors (see below), whose sum is σ = 1401515136. Its totient is φ = 1036403200.

The previous prime is 1212322273. The next prime is 1212322313. The reversal of 1212322309 is 9032232121.

It is a cyclic number.

It is not a de Polignac number, because 1212322309 - 2¹⁷ = 1212191237 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 (1212322369) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319944 + ... + 323710.

It is an arithmetic number, because the mean of its divisors is an integer number (87594696).

Almost surely, 2^1212322309 is an apocalyptic number.

It is an amenable number.

1212322309 is a deficient number, since it is larger than the sum of its proper divisors (189192827).

1212322309 is a wasteful number, since it uses less digits than its factorization.

1212322309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5516.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 1212322309 is about 34818.4191054103. The cubic root of 1212322309 is about 1066.2835249697.

It can be divided in two parts, 12 and 12322309, that added together give a palindrome (12322321).

The spelling of 1212322309 in words is "one billion, two hundred twelve million, three hundred twenty-two thousand, three hundred nine".