343891 has 2 divisors, whose sum is σ = 343892. Its totient is φ = 343890.

The previous prime is 343831. The next prime is 343897. The reversal of 343891 is 198343.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 343891 - 2⁹ = 343379 is a prime.

It is a super-2 number, since 2×343891² = 236522039762, which contains 22 as substring.

343891 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (343897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171945 + 171946.

It is an arithmetic number, because the mean of its divisors is an integer number (171946).

2³⁴³⁸⁹¹ is an apocalyptic number.

343891 is a deficient number, since it is larger than the sum of its proper divisors (1).

343891 is an equidigital number, since it uses as much as digits as its factorization.

343891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 28.

The square root of 343891 is about 586.4222028539. The cubic root of 343891 is about 70.0605598370.

The spelling of 343891 in words is "three hundred forty-three thousand, eight hundred ninety-one".