318943743449 has 2 divisors, whose sum is σ = 318943743450. Its totient is φ = 318943743448.

The previous prime is 318943743427. The next prime is 318943743457. The reversal of 318943743449 is 944347349813.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 218679687424 + 100264056025 = 467632^2 + 316645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318943743449 is a prime.

It is a super-3 number, since 3×318943743449³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (318943743479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159471871724 + 159471871725.

It is an arithmetic number, because the mean of its divisors is an integer number (159471871725).

Almost surely, 2^318943743449 is an apocalyptic number.

It is an amenable number.

318943743449 is a deficient number, since it is larger than the sum of its proper divisors (1).

318943743449 is an equidigital number, since it uses as much as digits as its factorization.

318943743449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 59.

The spelling of 318943743449 in words is "three hundred eighteen billion, nine hundred forty-three million, seven hundred forty-three thousand, four hundred forty-nine".