1215671465 has 4 divisors (see below), whose sum is σ = 1458805764. Its totient is φ = 972537168.

The previous prime is 1215671453. The next prime is 1215671467. The reversal of 1215671465 is 5641765121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 343768681 + 871902784 = 18541^2 + 29528^2 .

It is a cyclic number.

It is not a de Polignac number, because 1215671465 - 2⁴ = 1215671449 is a prime.

It is a super-2 number, since 2×1215671465² = 2955714221630492450, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1215671467) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121567142 + ... + 121567151.

It is an arithmetic number, because the mean of its divisors is an integer number (364701441).

Almost surely, 2^1215671465 is an apocalyptic number.

It is an amenable number.

1215671465 is a deficient number, since it is larger than the sum of its proper divisors (243134299).

1215671465 is an equidigital number, since it uses as much as digits as its factorization.

1215671465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243134298.

The product of its digits is 50400, while the sum is 38.

The square root of 1215671465 is about 34866.4805364694. The cubic root of 1215671465 is about 1067.2645254648.

The spelling of 1215671465 in words is "one billion, two hundred fifteen million, six hundred seventy-one thousand, four hundred sixty-five".