1212323909 has 2 divisors, whose sum is σ = 1212323910. Its totient is φ = 1212323908.

The previous prime is 1212323891. The next prime is 1212323933. The reversal of 1212323909 is 9093232121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 830707684 + 381616225 = 28822^2 + 19535^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212323909 - 2¹² = 1212319813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212323999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606161954 + 606161955.

It is an arithmetic number, because the mean of its divisors is an integer number (606161955).

Almost surely, 2^1212323909 is an apocalyptic number.

It is an amenable number.

1212323909 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212323909 is an equidigital number, since it uses as much as digits as its factorization.

1212323909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 1212323909 is about 34818.4420817474. The cubic root of 1212323909 is about 1066.2839940564.

The spelling of 1212323909 in words is "one billion, two hundred twelve million, three hundred twenty-three thousand, nine hundred nine".