1215412397 has 2 divisors, whose sum is σ = 1215412398. Its totient is φ = 1215412396.

The previous prime is 1215412379. The next prime is 1215412421. The reversal of 1215412397 is 7932145121.

Together with previous prime (1215412379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1213059241 + 2353156 = 34829^2 + 1534^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215412397 - 2⁶ = 1215412333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1215412337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607706198 + 607706199.

It is an arithmetic number, because the mean of its divisors is an integer number (607706199).

Almost surely, 2^1215412397 is an apocalyptic number.

It is an amenable number.

1215412397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215412397 is an equidigital number, since it uses as much as digits as its factorization.

1215412397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 35.

The square root of 1215412397 is about 34862.7651944019. The cubic root of 1215412397 is about 1067.1887062605.

The spelling of 1215412397 in words is "one billion, two hundred fifteen million, four hundred twelve thousand, three hundred ninety-seven".