1215397697 has 2 divisors, whose sum is σ = 1215397698. Its totient is φ = 1215397696.

The previous prime is 1215397669. The next prime is 1215397751. The reversal of 1215397697 is 7967935121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1150498561 + 64899136 = 33919^2 + 8056^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215397697 - 2¹⁴ = 1215381313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1215397637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607698848 + 607698849.

It is an arithmetic number, because the mean of its divisors is an integer number (607698849).

Almost surely, 2^1215397697 is an apocalyptic number.

It is an amenable number.

1215397697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215397697 is an equidigital number, since it uses as much as digits as its factorization.

1215397697 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 714420, while the sum is 50.

The square root of 1215397697 is about 34862.5543671143. The cubic root of 1215397697 is about 1067.1844038149.

The spelling of 1215397697 in words is "one billion, two hundred fifteen million, three hundred ninety-seven thousand, six hundred ninety-seven".