318720629 has 2 divisors, whose sum is σ = 318720630. Its totient is φ = 318720628.

The previous prime is 318720617. The next prime is 318720631. The reversal of 318720629 is 926027813.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 220671025 + 98049604 = 14855^2 + 9902^2 .

It is an emirp because it is prime and its reverse (926027813) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-318720629 is a prime.

Together with 318720631, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 318720592 and 318720601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (318720329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 159360314 + 159360315.

It is an arithmetic number, because the mean of its divisors is an integer number (159360315).

Almost surely, 2^318720629 is an apocalyptic number.

It is an amenable number.

318720629 is a deficient number, since it is larger than the sum of its proper divisors (1).

318720629 is an equidigital number, since it uses as much as digits as its factorization.

318720629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 318720629 is about 17852.7484998809. The cubic root of 318720629 is about 683.0776221618.

The spelling of 318720629 in words is "three hundred eighteen million, seven hundred twenty thousand, six hundred twenty-nine".