1243313969 has 2 divisors, whose sum is σ = 1243313970. Its totient is φ = 1243313968.

The previous prime is 1243313947. The next prime is 1243314029. The reversal of 1243313969 is 9693133421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 784840225 + 458473744 = 28015^2 + 21412^2 .

It is a cyclic number.

It is not a de Polignac number, because 1243313969 - 2²⁰ = 1242265393 is a prime.

It is a super-2 number, since 2×1243313969² = 3091659251021065922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1243310969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 621656984 + 621656985.

It is an arithmetic number, because the mean of its divisors is an integer number (621656985).

Almost surely, 2^1243313969 is an apocalyptic number.

It is an amenable number.

1243313969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1243313969 is an equidigital number, since it uses as much as digits as its factorization.

1243313969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 41.

The square root of 1243313969 is about 35260.6575236481. The cubic root of 1243313969 is about 1075.2932948417.

The spelling of 1243313969 in words is "one billion, two hundred forty-three million, three hundred thirteen thousand, nine hundred sixty-nine".