1215518871 has 16 divisors (see below), whose sum is σ = 1854217728. Its totient is φ = 693832800.

The previous prime is 1215518861. The next prime is 1215518893. The reversal of 1215518871 is 1788155121.

It is not a de Polignac number, because 1215518871 - 2⁶ = 1215518807 is a prime.

It is a super-2 number, since 2×1215518871² = 2954972251514229282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215518831) 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, 10995 + ... + 50516.

It is an arithmetic number, because the mean of its divisors is an integer number (115888608).

Almost surely, 2^1215518871 is an apocalyptic number.

1215518871 is a deficient number, since it is larger than the sum of its proper divisors (638698857).

1215518871 is an equidigital number, since it uses as much as digits as its factorization.

1215518871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62462.

The product of its digits is 22400, while the sum is 39.

The square root of 1215518871 is about 34864.2922056364. The cubic root of 1215518871 is about 1067.2198683947.

The spelling of 1215518871 in words is "one billion, two hundred fifteen million, five hundred eighteen thousand, eight hundred seventy-one".