1312156205 has 8 divisors (see below), whose sum is σ = 1575063672. Its totient is φ = 1049407488.

The previous prime is 1312156201. The next prime is 1312156249. The reversal of 1312156205 is 5026512131.

It can be written as a sum of positive squares in 4 ways, for example, as 22915369 + 1289240836 = 4787^2 + 35906^2 .

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 1312156205 - 2² = 1312156201 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312156201) 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 7 ways as a sum of consecutive naturals, for example, 20672 + ... + 55241.

It is an arithmetic number, because the mean of its divisors is an integer number (196882959).

Almost surely, 2^1312156205 is an apocalyptic number.

It is an amenable number.

1312156205 is a deficient number, since it is larger than the sum of its proper divisors (262907467).

1312156205 is an equidigital number, since it uses as much as digits as its factorization.

1312156205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79375.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 1312156205 is about 36223.6967329399. The cubic root of 1312156205 is about 1094.7841793678.

Adding to 1312156205 its reverse (5026512131), we get a palindrome (6338668336).

The spelling of 1312156205 in words is "one billion, three hundred twelve million, one hundred fifty-six thousand, two hundred five".