1313437865 has 8 divisors (see below), whose sum is σ = 1577066568. Its totient is φ = 1050122880.

The previous prime is 1313437859. The next prime is 1313437919. The reversal of 1313437865 is 5687343131.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 197009296 + 1116428569 = 14036^2 + 33413^2 .

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

It is not a de Polignac number, because 1313437865 - 2⁴ = 1313437849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69116 + ... + 86045.

It is an arithmetic number, because the mean of its divisors is an integer number (197133321).

Almost surely, 2^1313437865 is an apocalyptic number.

It is an amenable number.

1313437865 is a deficient number, since it is larger than the sum of its proper divisors (263628703).

1313437865 is a wasteful number, since it uses less digits than its factorization.

1313437865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156859.

The product of its digits is 181440, while the sum is 41.

The square root of 1313437865 is about 36241.3833207288. The cubic root of 1313437865 is about 1095.1405100370.

The spelling of 1313437865 in words is "one billion, three hundred thirteen million, four hundred thirty-seven thousand, eight hundred sixty-five".