1215532897 has 6 divisors (see below), whose sum is σ = 1229352038. Its totient is φ = 1201867392.

The previous prime is 1215532859. The next prime is 1215532907. The reversal of 1215532897 is 7982355121.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 177662241 + 1037870656 = 13329^2 + 32216^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1215532897 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215532817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68808 + ... + 84649.

Almost surely, 2^1215532897 is an apocalyptic number.

It is an amenable number.

1215532897 is a deficient number, since it is larger than the sum of its proper divisors (13819141).

1215532897 is an frugal number, since it uses more digits than its factorization.

1215532897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153635 (or 153546 counting only the distinct ones).

The product of its digits is 151200, while the sum is 43.

The square root of 1215532897 is about 34864.4933564221. The cubic root of 1215532897 is about 1067.2239732996.

The spelling of 1215532897 in words is "one billion, two hundred fifteen million, five hundred thirty-two thousand, eight hundred ninety-seven".