1213251239 has 2 divisors, whose sum is σ = 1213251240. Its totient is φ = 1213251238.

The previous prime is 1213251229. The next prime is 1213251287. The reversal of 1213251239 is 9321523121.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1213251239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1213251229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606625619 + 606625620.

It is an arithmetic number, because the mean of its divisors is an integer number (606625620).

Almost surely, 2^1213251239 is an apocalyptic number.

1213251239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213251239 is an equidigital number, since it uses as much as digits as its factorization.

1213251239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3240, while the sum is 29.

The square root of 1213251239 is about 34831.7561859864. The cubic root of 1213251239 is about 1066.5557985138. Note that the first 3 decimals are identical.

The spelling of 1213251239 in words is "one billion, two hundred thirteen million, two hundred fifty-one thousand, two hundred thirty-nine".