321234391 has 2 divisors, whose sum is σ = 321234392. Its totient is φ = 321234390.

The previous prime is 321234373. The next prime is 321234413. The reversal of 321234391 is 193432123.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 321234391 - 2¹⁷ = 321103319 is a prime.

It is a super-2 number, since 2×321234391² = 206383067922281762, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (321234301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 160617195 + 160617196.

It is an arithmetic number, because the mean of its divisors is an integer number (160617196).

Almost surely, 2^321234391 is an apocalyptic number.

321234391 is a deficient number, since it is larger than the sum of its proper divisors (1).

321234391 is an equidigital number, since it uses as much as digits as its factorization.

321234391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3888, while the sum is 28.

The square root of 321234391 is about 17923.0128884627. The cubic root of 321234391 is about 684.8687414333.

The spelling of 321234391 in words is "three hundred twenty-one million, two hundred thirty-four thousand, three hundred ninety-one".