647811349 has 2 divisors, whose sum is σ = 647811350. Its totient is φ = 647811348.

The previous prime is 647811341. The next prime is 647811397. The reversal of 647811349 is 943118746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 379080900 + 268730449 = 19470^2 + 16393^2 .

It is a cyclic number.

It is not a de Polignac number, because 647811349 - 2³ = 647811341 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (647811341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323905674 + 323905675.

It is an arithmetic number, because the mean of its divisors is an integer number (323905675).

Almost surely, 2^647811349 is an apocalyptic number.

It is an amenable number.

647811349 is a deficient number, since it is larger than the sum of its proper divisors (1).

647811349 is an equidigital number, since it uses as much as digits as its factorization.

647811349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 43.

The square root of 647811349 is about 25452.1383973921. The cubic root of 647811349 is about 865.2657581624.

The spelling of 647811349 in words is "six hundred forty-seven million, eight hundred eleven thousand, three hundred forty-nine".