1312012243 has 4 divisors (see below), whose sum is σ = 1321451320. Its totient is φ = 1302573168.

The previous prime is 1312012241. The next prime is 1312012271. The reversal of 1312012243 is 3422102131.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1312012243 - 2¹ = 1312012241 is a prime.

It is a super-2 number, since 2×1312012243² = 3442752251563782098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1312012243.

It is not an unprimeable number, because it can be changed into a prime (1312012241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4719330 + ... + 4719607.

It is an arithmetic number, because the mean of its divisors is an integer number (330362830).

Almost surely, 2^1312012243 is an apocalyptic number.

1312012243 is a deficient number, since it is larger than the sum of its proper divisors (9439077).

1312012243 is an equidigital number, since it uses as much as digits as its factorization.

1312012243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9439076.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1312012243 is about 36221.7095538021. The cubic root of 1312012243 is about 1094.7441401602.

Adding to 1312012243 its reverse (3422102131), we get a palindrome (4734114374).

The spelling of 1312012243 in words is "one billion, three hundred twelve million, twelve thousand, two hundred forty-three".