1215133426 has 8 divisors (see below), whose sum is σ = 1962907884. Its totient is φ = 560830800.

The previous prime is 1215133357. The next prime is 1215133457. The reversal of 1215133426 is 6243315121.

It can be written as a sum of positive squares in 2 ways, for example, as 1214452801 + 680625 = 34849^2 + 825^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 1215133394 and 1215133403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23367925 + ... + 23367976.

Almost surely, 2^1215133426 is an apocalyptic number.

1215133426 is a deficient number, since it is larger than the sum of its proper divisors (747774458).

1215133426 is a wasteful number, since it uses less digits than its factorization.

1215133426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46735916.

The product of its digits is 4320, while the sum is 28.

The square root of 1215133426 is about 34858.7639769399. The cubic root of 1215133426 is about 1067.1070501680.

Adding to 1215133426 its reverse (6243315121), we get a palindrome (7458448547).

The spelling of 1215133426 in words is "one billion, two hundred fifteen million, one hundred thirty-three thousand, four hundred twenty-six".