1215143225 has 6 divisors (see below), whose sum is σ = 1506777630. Its totient is φ = 972114560.

The previous prime is 1215143191. The next prime is 1215143249. The reversal of 1215143225 is 5223415121.

It can be written as a sum of positive squares in 3 ways, for example, as 6677056 + 1208466169 = 2584^2 + 34763^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1215143225 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1215143194 and 1215143203.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24302840 + ... + 24302889.

It is an arithmetic number, because the mean of its divisors is an integer number (251129605).

Almost surely, 2^1215143225 is an apocalyptic number.

It is an amenable number.

1215143225 is a deficient number, since it is larger than the sum of its proper divisors (291634405).

1215143225 is an equidigital number, since it uses as much as digits as its factorization.

1215143225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48605739 (or 48605734 counting only the distinct ones).

The product of its digits is 2400, while the sum is 26.

The square root of 1215143225 is about 34858.9045295460. The cubic root of 1215143225 is about 1067.1099185921.

Adding to 1215143225 its reverse (5223415121), we get a palindrome (6438558346).

The spelling of 1215143225 in words is "one billion, two hundred fifteen million, one hundred forty-three thousand, two hundred twenty-five".