1215387697 has 2 divisors, whose sum is σ = 1215387698. Its totient is φ = 1215387696.

The previous prime is 1215387683. The next prime is 1215387703. The reversal of 1215387697 is 7967835121.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1177244721 + 38142976 = 34311^2 + 6176^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1215387697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1215387697.

It is not a weakly prime, because it can be changed into another prime (1215397697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607693848 + 607693849.

It is an arithmetic number, because the mean of its divisors is an integer number (607693849).

Almost surely, 2^1215387697 is an apocalyptic number.

It is an amenable number.

1215387697 is a deficient number, since it is larger than the sum of its proper divisors (1).

1215387697 is an equidigital number, since it uses as much as digits as its factorization.

1215387697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 49.

The square root of 1215387697 is about 34862.4109464621. The cubic root of 1215387697 is about 1067.1814769613.

The spelling of 1215387697 in words is "one billion, two hundred fifteen million, three hundred eighty-seven thousand, six hundred ninety-seven".