1215131504 has 20 divisors (see below), whose sum is σ = 2417948664. Its totient is φ = 591144768.

The previous prime is 1215131429. The next prime is 1215131531. The reversal of 1215131504 is 4051315121.

It is a self number, because there is not a number n which added to its sum of digits gives 1215131504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1025702 + ... + 1026885.

Almost surely, 2^1215131504 is an apocalyptic number.

It is an amenable number.

1215131504 is a deficient number, since it is larger than the sum of its proper divisors (1202817160).

1215131504 is a wasteful number, since it uses less digits than its factorization.

1215131504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052632 (or 2052626 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 23.

The square root of 1215131504 is about 34858.7364085390. The cubic root of 1215131504 is about 1067.1064875464.

Adding to 1215131504 its reverse (4051315121), we get a palindrome (5266446625).

The spelling of 1215131504 in words is "one billion, two hundred fifteen million, one hundred thirty-one thousand, five hundred four".