1215113553 has 6 divisors (see below), whose sum is σ = 1755164034. Its totient is φ = 810075696.

The previous prime is 1215113551. The next prime is 1215113569. The reversal of 1215113553 is 3553115121.

It can be written as a sum of positive squares in only one way, i.e., 1141291089 + 73822464 = 33783^2 + 8592^2 .

It is not a de Polignac number, because 1215113553 - 2¹ = 1215113551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1215113551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67506300 + ... + 67506317.

It is an arithmetic number, because the mean of its divisors is an integer number (292527339).

Almost surely, 2^1215113553 is an apocalyptic number.

It is an amenable number.

1215113553 is a deficient number, since it is larger than the sum of its proper divisors (540050481).

1215113553 is a wasteful number, since it uses less digits than its factorization.

1215113553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135012623 (or 135012620 counting only the distinct ones).

The product of its digits is 2250, while the sum is 27.

The square root of 1215113553 is about 34858.4789255068. The cubic root of 1215113553 is about 1067.1012327728.

Adding to 1215113553 its reverse (3553115121), we get a palindrome (4768228674).

The spelling of 1215113553 in words is "one billion, two hundred fifteen million, one hundred thirteen thousand, five hundred fifty-three".