1213212239 has 2 divisors, whose sum is σ = 1213212240. Its totient is φ = 1213212238.

The previous prime is 1213212199. The next prime is 1213212281. The reversal of 1213212239 is 9322123121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213212239 - 2²⁸ = 944776783 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213212289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606606119 + 606606120.

It is an arithmetic number, because the mean of its divisors is an integer number (606606120).

Almost surely, 2^1213212239 is an apocalyptic number.

1213212239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213212239 is an equidigital number, since it uses as much as digits as its factorization.

1213212239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 26.

The square root of 1213212239 is about 34831.1963475273. The cubic root of 1213212239 is about 1066.5443702345.

The spelling of 1213212239 in words is "one billion, two hundred thirteen million, two hundred twelve thousand, two hundred thirty-nine".