1215143553 has 16 divisors (see below), whose sum is σ = 1745513280. Its totient is φ = 747484224.

The previous prime is 1215143533. The next prime is 1215143569. The reversal of 1215143553 is 3553415121.

It is not a de Polignac number, because 1215143553 - 2¹⁴ = 1215127169 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1215143553.

It is not an unprimeable number, because it can be changed into a prime (1215143513) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133378 + ... + 142196.

It is an arithmetic number, because the mean of its divisors is an integer number (109094580).

Almost surely, 2^1215143553 is an apocalyptic number.

1215143553 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1215143553 is a deficient number, since it is larger than the sum of its proper divisors (530369727).

1215143553 is a wasteful number, since it uses less digits than its factorization.

1215143553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12368.

The product of its digits is 9000, while the sum is 30.

The square root of 1215143553 is about 34858.9092342259. The cubic root of 1215143553 is about 1067.1100146060.

Adding to 1215143553 its reverse (3553415121), we get a palindrome (4768558674).

The spelling of 1215143553 in words is "one billion, two hundred fifteen million, one hundred forty-three thousand, five hundred fifty-three".