343441991 has 2 divisors, whose sum is σ = 343441992. Its totient is φ = 343441990.

The previous prime is 343441949. The next prime is 343442023. The reversal of 343441991 is 199144343.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-343441991 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (343441391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171720995 + 171720996.

It is an arithmetic number, because the mean of its divisors is an integer number (171720996).

Almost surely, 2^343441991 is an apocalyptic number.

343441991 is a deficient number, since it is larger than the sum of its proper divisors (1).

343441991 is an equidigital number, since it uses as much as digits as its factorization.

343441991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 343441991 is about 18532.1879712030. The cubic root of 343441991 is about 700.3005450921.

The spelling of 343441991 in words is "three hundred forty-three million, four hundred forty-one thousand, nine hundred ninety-one".