4231391 has 2 divisors, whose sum is σ = 4231392. Its totient is φ = 4231390.

The previous prime is 4231373. The next prime is 4231393. The reversal of 4231391 is 1931324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4231391 - 2¹⁸ = 3969247 is a prime.

Together with 4231393, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4231393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2115695 + 2115696.

It is an arithmetic number, because the mean of its divisors is an integer number (2115696).

Almost surely, 2^4231391 is an apocalyptic number.

4231391 is a deficient number, since it is larger than the sum of its proper divisors (1).

4231391 is an equidigital number, since it uses as much as digits as its factorization.

4231391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 23.

The square root of 4231391 is about 2057.0345159963. The cubic root of 4231391 is about 161.7438287314.

The spelling of 4231391 in words is "four million, two hundred thirty-one thousand, three hundred ninety-one".