1215567165 has 32 divisors (see below), whose sum is σ = 1987301376. Its totient is φ = 634314240.

The previous prime is 1215567163. The next prime is 1215567203. The reversal of 1215567165 is 5617655121.

It is a happy number.

It is not a de Polignac number, because 1215567165 - 2¹ = 1215567163 is a prime.

It is a super-2 number, since 2×1215567165² = 2955207065252274450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1215567163) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 134695 + ... + 143435.

It is an arithmetic number, because the mean of its divisors is an integer number (62103168).

Almost surely, 2^1215567165 is an apocalyptic number.

1215567165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1215567165 is a deficient number, since it is larger than the sum of its proper divisors (771734211).

1215567165 is a wasteful number, since it uses less digits than its factorization.

1215567165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8949.

The product of its digits is 63000, while the sum is 39.

The square root of 1215567165 is about 34864.9847985052. The cubic root of 1215567165 is about 1067.2340021760.

The spelling of 1215567165 in words is "one billion, two hundred fifteen million, five hundred sixty-seven thousand, one hundred sixty-five".