3138791 has 2 divisors, whose sum is σ = 3138792. Its totient is φ = 3138790.

The previous prime is 3138769. The next prime is 3138799. The reversal of 3138791 is 1978313.

It is a strong prime.

It is an emirp because it is prime and its reverse (1978313) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3138791 - 2¹⁸ = 2876647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3138799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569395 + 1569396.

It is an arithmetic number, because the mean of its divisors is an integer number (1569396).

Almost surely, 2^3138791 is an apocalyptic number.

3138791 is a deficient number, since it is larger than the sum of its proper divisors (1).

3138791 is an equidigital number, since it uses as much as digits as its factorization.

3138791 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 32.

The square root of 3138791 is about 1771.6633427376. The cubic root of 3138791 is about 146.4156386640.

The spelling of 3138791 in words is "three million, one hundred thirty-eight thousand, seven hundred ninety-one".