1312512709 has 4 divisors (see below), whose sum is σ = 1324554220. Its totient is φ = 1300471200.

The previous prime is 1312512673. The next prime is 1312512737. The reversal of 1312512709 is 9072152131.

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 352876225 + 959636484 = 18785^2 + 30978^2 .

It is a cyclic number.

It is not a de Polignac number, because 1312512709 - 2¹³ = 1312504517 is a prime.

It is a super-2 number, since 2×1312512709² = 3445379222573037362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312512739) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6020592 + ... + 6020809.

It is an arithmetic number, because the mean of its divisors is an integer number (331138555).

Almost surely, 2^1312512709 is an apocalyptic number.

It is an amenable number.

1312512709 is a deficient number, since it is larger than the sum of its proper divisors (12041511).

1312512709 is a wasteful number, since it uses less digits than its factorization.

1312512709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12041510.

The product of its (nonzero) digits is 3780, while the sum is 31.

The square root of 1312512709 is about 36228.6172659129. The cubic root of 1312512709 is about 1094.8833188849.

The spelling of 1312512709 in words is "one billion, three hundred twelve million, five hundred twelve thousand, seven hundred nine".