1215289321 has 9 divisors (see below), whose sum is σ = 1235162749. Its totient is φ = 1195732300.

The previous prime is 1215289303. The next prime is 1215289331. The reversal of 1215289321 is 1239825121.

The square root of 1215289321 is 34861.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 1215289321 - 2⁷ = 1215289193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215289301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2474886 + ... + 2475376.

Almost surely, 2^1215289321 is an apocalyptic number.

1215289321 is the 34861-st square number.

1215289321 is the 17431-st centered octagonal number.

It is an amenable number.

1215289321 is a deficient number, since it is larger than the sum of its proper divisors (19873428).

1215289321 is an frugal number, since it uses more digits than its factorization.

1215289321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1124 (or 562 counting only the distinct ones).

The product of its digits is 8640, while the sum is 34.

The cubic root of 1215289321 is about 1067.1526828907.

The spelling of 1215289321 in words is "one billion, two hundred fifteen million, two hundred eighty-nine thousand, three hundred twenty-one".