343131391 has 2 divisors, whose sum is σ = 343131392. Its totient is φ = 343131390.

The previous prime is 343131367. The next prime is 343131407. The reversal of 343131391 is 193131343.

It is a strong prime.

It is an emirp because it is prime and its reverse (193131343) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 343131391 - 2⁵ = 343131359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343131301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171565695 + 171565696.

It is an arithmetic number, because the mean of its divisors is an integer number (171565696).

Almost surely, 2^343131391 is an apocalyptic number.

343131391 is a deficient number, since it is larger than the sum of its proper divisors (1).

343131391 is an equidigital number, since it uses as much as digits as its factorization.

343131391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916, while the sum is 28.

The square root of 343131391 is about 18523.8060613903. The cubic root of 343131391 is about 700.0893702221.

The spelling of 343131391 in words is "three hundred forty-three million, one hundred thirty-one thousand, three hundred ninety-one".