1215212945 has 8 divisors (see below), whose sum is σ = 1458447144. Its totient is φ = 972042624.

The previous prime is 1215212917. The next prime is 1215212951. The reversal of 1215212945 is 5492125121.

It can be written as a sum of positive squares in 4 ways, for example, as 58736896 + 1156476049 = 7664^2 + 34007^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1215212945 - 2¹² = 1215208849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52877 + ... + 72293.

It is an arithmetic number, because the mean of its divisors is an integer number (182305893).

Almost surely, 2^1215212945 is an apocalyptic number.

It is an amenable number.

1215212945 is a deficient number, since it is larger than the sum of its proper divisors (243234199).

1215212945 is a wasteful number, since it uses less digits than its factorization.

1215212945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31939.

The product of its digits is 7200, while the sum is 32.

The square root of 1215212945 is about 34859.9045466278. The cubic root of 1215212945 is about 1067.1303270178.

The spelling of 1215212945 in words is "one billion, two hundred fifteen million, two hundred twelve thousand, nine hundred forty-five".