347678813 has 2 divisors, whose sum is σ = 347678814. Its totient is φ = 347678812.

The previous prime is 347678809. The next prime is 347678867. The reversal of 347678813 is 318876743.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 213072409 + 134606404 = 14597^2 + 11602^2 .

It is an emirp because it is prime and its reverse (318876743) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 347678813 - 2² = 347678809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (347678873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 173839406 + 173839407.

It is an arithmetic number, because the mean of its divisors is an integer number (173839407).

Almost surely, 2^347678813 is an apocalyptic number.

It is an amenable number.

347678813 is a deficient number, since it is larger than the sum of its proper divisors (1).

347678813 is an equidigital number, since it uses as much as digits as its factorization.

347678813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 677376, while the sum is 47.

The square root of 347678813 is about 18646.1474036864. The cubic root of 347678813 is about 703.1685023369.

The spelling of 347678813 in words is "three hundred forty-seven million, six hundred seventy-eight thousand, eight hundred thirteen".