334128391 has 2 divisors, whose sum is σ = 334128392. Its totient is φ = 334128390.

The previous prime is 334128371. The next prime is 334128407. The reversal of 334128391 is 193821433.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 334128391 - 2⁵ = 334128359 is a prime.

It is a super-2 number, since 2×334128391² = 223283563344497762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (334128371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167064195 + 167064196.

It is an arithmetic number, because the mean of its divisors is an integer number (167064196).

Almost surely, 2^334128391 is an apocalyptic number.

334128391 is a deficient number, since it is larger than the sum of its proper divisors (1).

334128391 is an equidigital number, since it uses as much as digits as its factorization.

334128391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15552, while the sum is 34.

The square root of 334128391 is about 18279.1791664724. The cubic root of 334128391 is about 693.9120988422.

The spelling of 334128391 in words is "three hundred thirty-four million, one hundred twenty-eight thousand, three hundred ninety-one".