1215344231 has 2 divisors, whose sum is σ = 1215344232. Its totient is φ = 1215344230.

The previous prime is 1215344213. The next prime is 1215344261. The reversal of 1215344231 is 1324435121.

It is a happy number.

Together with previous prime (1215344213) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1215344231 - 2⁶ = 1215344167 is a prime.

It is a super-2 number, since 2×1215344231² = 2954123199649962722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1215344231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215344261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607672115 + 607672116.

It is an arithmetic number, because the mean of its divisors is an integer number (607672116).

Almost surely, 2^1215344231 is an apocalyptic number.

1215344231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215344231 is an equidigital number, since it uses as much as digits as its factorization.

1215344231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2880, while the sum is 26.

The square root of 1215344231 is about 34861.7875473992. The cubic root of 1215344231 is about 1067.1687549130.

Adding to 1215344231 its reverse (1324435121), we get a palindrome (2539779352).

The spelling of 1215344231 in words is "one billion, two hundred fifteen million, three hundred forty-four thousand, two hundred thirty-one".