1215839213 has 2 divisors, whose sum is σ = 1215839214. Its totient is φ = 1215839212.

The previous prime is 1215839197. The next prime is 1215839221. The reversal of 1215839213 is 3129385121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 934035844 + 281803369 = 30562^2 + 16787^2 .

It is an emirp because it is prime and its reverse (3129385121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1215839213 - 2⁴ = 1215839197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215839263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607919606 + 607919607.

It is an arithmetic number, because the mean of its divisors is an integer number (607919607).

Almost surely, 2^1215839213 is an apocalyptic number.

It is an amenable number.

1215839213 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215839213 is an equidigital number, since it uses as much as digits as its factorization.

1215839213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 1215839213 is about 34868.8860303853. The cubic root of 1215839213 is about 1067.3136130844.

The spelling of 1215839213 in words is "one billion, two hundred fifteen million, eight hundred thirty-nine thousand, two hundred thirteen".