343161991 has 2 divisors, whose sum is σ = 343161992. Its totient is φ = 343161990.

The previous prime is 343161941. The next prime is 343162103. The reversal of 343161991 is 199161343.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343161991 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 343161991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343161941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171580995 + 171580996.

It is an arithmetic number, because the mean of its divisors is an integer number (171580996).

Almost surely, 2^343161991 is an apocalyptic number.

343161991 is a deficient number, since it is larger than the sum of its proper divisors (1).

343161991 is an equidigital number, since it uses as much as digits as its factorization.

343161991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 343161991 is about 18524.6320071412. The cubic root of 343161991 is about 700.1101806157.

The spelling of 343161991 in words is "three hundred forty-three million, one hundred sixty-one thousand, nine hundred ninety-one".