1312200005 has 16 divisors (see below), whose sum is σ = 1621031664. Its totient is φ = 1018967040.

The previous prime is 1312199981. The next prime is 1312200007. The reversal of 1312200005 is 5000022131.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 250873921 + 1061326084 = 15839^2 + 32578^2 .

It is not a de Polignac number, because 1312200005 - 2²² = 1308005701 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 (1312200007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71915 + ... + 88295.

It is an arithmetic number, because the mean of its divisors is an integer number (101314479).

Almost surely, 2^1312200005 is an apocalyptic number.

It is an amenable number.

1312200005 is a deficient number, since it is larger than the sum of its proper divisors (308831659).

1312200005 is a wasteful number, since it uses less digits than its factorization.

1312200005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16856.

The product of its (nonzero) digits is 60, while the sum is 14.

The square root of 1312200005 is about 36224.3013045110. The cubic root of 1312200005 is about 1094.7963605937.

Adding to 1312200005 its reverse (5000022131), we get a palindrome (6312222136).

The spelling of 1312200005 in words is "one billion, three hundred twelve million, two hundred thousand, five".