647342347 has 2 divisors, whose sum is σ = 647342348. Its totient is φ = 647342346.

The previous prime is 647342329. The next prime is 647342363. The reversal of 647342347 is 743243746.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 647342347 - 2⁷ = 647342219 is a prime.

It is a super-2 number, since 2×647342347² = 838104228438936818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (647342447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323671173 + 323671174.

It is an arithmetic number, because the mean of its divisors is an integer number (323671174).

Almost surely, 2^647342347 is an apocalyptic number.

647342347 is a deficient number, since it is larger than the sum of its proper divisors (1).

647342347 is an equidigital number, since it uses as much as digits as its factorization.

647342347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 338688, while the sum is 40.

The square root of 647342347 is about 25442.9233186755. The cubic root of 647342347 is about 865.0568962542.

It can be divided in two parts, 64734 and 2347, that added together give a square (67081 = 259²).

The spelling of 647342347 in words is "six hundred forty-seven million, three hundred forty-two thousand, three hundred forty-seven".