1215122245 has 8 divisors (see below), whose sum is σ = 1458994680. Its totient is φ = 971532480.

The previous prime is 1215122239. The next prime is 1215122273. The reversal of 1215122245 is 5422215121.

It can be written as a sum of positive squares in 4 ways, for example, as 27217089 + 1187905156 = 5217^2 + 34466^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-1215122245 is a prime.

It is a congruent 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, 61090 + ... + 78499.

It is an arithmetic number, because the mean of its divisors is an integer number (182374335).

Almost surely, 2^1215122245 is an apocalyptic number.

It is an amenable number.

1215122245 is a deficient number, since it is larger than the sum of its proper divisors (243872435).

1215122245 is a wasteful number, since it uses less digits than its factorization.

1215122245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141335.

The product of its digits is 1600, while the sum is 25.

The square root of 1215122245 is about 34858.6036008329. The cubic root of 1215122245 is about 1067.1037771775.

Adding to 1215122245 its reverse (5422215121), we get a palindrome (6637337366).

The spelling of 1215122245 in words is "one billion, two hundred fifteen million, one hundred twenty-two thousand, two hundred forty-five".