3139991 has 2 divisors, whose sum is σ = 3139992. Its totient is φ = 3139990.

The previous prime is 3139979. The next prime is 3139993. The reversal of 3139991 is 1999313.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3139991 is a prime.

It is a super-3 number, since 3×3139991³ = 92876633374689057813, which contains 333 as substring.

It is a Sophie Germain prime.

Together with 3139993, 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 (3139993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1569995 + 1569996.

It is an arithmetic number, because the mean of its divisors is an integer number (1569996).

Almost surely, 2^3139991 is an apocalyptic number.

3139991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3139991 is an equidigital number, since it uses as much as digits as its factorization.

3139991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6561, while the sum is 35.

The square root of 3139991 is about 1772.0019751682. The cubic root of 3139991 is about 146.4342951447.

The spelling of 3139991 in words is "three million, one hundred thirty-nine thousand, nine hundred ninety-one".