2061391 has 2 divisors, whose sum is σ = 2061392. Its totient is φ = 2061390.

The previous prime is 2061383. The next prime is 2061413. The reversal of 2061391 is 1931602.

It is an a-pointer prime, because the next prime (2061413) can be obtained adding 2061391 to its sum of digits (22).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2061391 - 2³ = 2061383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2061331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030695 + 1030696.

It is an arithmetic number, because the mean of its divisors is an integer number (1030696).

2^2061391 is an apocalyptic number.

2061391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061391 is an equidigital number, since it uses as much as digits as its factorization.

2061391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 2061391 is about 1435.7545054779. The cubic root of 2061391 is about 127.2682654744.

Adding to 2061391 its reverse (1931602), we get a palindrome (3992993).

The spelling of 2061391 in words is "two million, sixty-one thousand, three hundred ninety-one".