1312280243 has 4 divisors (see below), whose sum is σ = 1312426368. Its totient is φ = 1312134120.

The previous prime is 1312280191. The next prime is 1312280257. The reversal of 1312280243 is 3420822131.

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 1312280243 - 2⁸ = 1312279987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312280273) 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, 58643 + ... + 77868.

It is an arithmetic number, because the mean of its divisors is an integer number (328106592).

Almost surely, 2^1312280243 is an apocalyptic number.

1312280243 is a deficient number, since it is larger than the sum of its proper divisors (146125).

1312280243 is an equidigital number, since it uses as much as digits as its factorization.

1312280243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146124.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 1312280243 is about 36225.4088037665. The cubic root of 1312280243 is about 1094.8186748953.

The spelling of 1312280243 in words is "one billion, three hundred twelve million, two hundred eighty thousand, two hundred forty-three".