391441 has 2 divisors, whose sum is σ = 391442. Its totient is φ = 391440.

The previous prime is 391403. The next prime is 391451. The reversal of 391441 is 144193.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 313600 + 77841 = 560^2 + 279^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-391441 is a prime.

391441 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195720 + 195721.

It is an arithmetic number, because the mean of its divisors is an integer number (195721).

2³⁹¹⁴⁴¹ is an apocalyptic number.

It is an amenable number.

391441 is a deficient number, since it is larger than the sum of its proper divisors (1).

391441 is an equidigital number, since it uses as much as digits as its factorization.

391441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432, while the sum is 22.

The square root of 391441 is about 625.6524594373. The cubic root of 391441 is about 73.1513093536.

The spelling of 391441 in words is "three hundred ninety-one thousand, four hundred forty-one".