1312642165 has 8 divisors (see below), whose sum is σ = 1667827800. Its totient is φ = 988342272.

The previous prime is 1312642153. The next prime is 1312642237. The reversal of 1312642165 is 5612462131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 213189201 + 1099452964 = 14601^2 + 33158^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1312642165 - 2¹¹ = 1312640117 is a prime.

It is a super-3 number, since 3×1312642165³ (a number of 28 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7721340 + ... + 7721509.

It is an arithmetic number, because the mean of its divisors is an integer number (208478475).

Almost surely, 2^1312642165 is an apocalyptic number.

It is an amenable number.

1312642165 is a deficient number, since it is larger than the sum of its proper divisors (355185635).

1312642165 is a wasteful number, since it uses less digits than its factorization.

1312642165 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15442871.

The product of its digits is 8640, while the sum is 31.

The square root of 1312642165 is about 36230.4038757505. The cubic root of 1312642165 is about 1094.9193146139.

The spelling of 1312642165 in words is "one billion, three hundred twelve million, six hundred forty-two thousand, one hundred sixty-five".