3115991 has 2 divisors, whose sum is σ = 3115992. Its totient is φ = 3115990.

The previous prime is 3115933. The next prime is 3115993. The reversal of 3115991 is 1995113.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3115991 - 2⁶ = 3115927 is a prime.

Together with 3115993, 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 (3115993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1557995 + 1557996.

It is an arithmetic number, because the mean of its divisors is an integer number (1557996).

Almost surely, 2^3115991 is an apocalyptic number.

3115991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3115991 is an equidigital number, since it uses as much as digits as its factorization.

3115991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1215, while the sum is 29.

The square root of 3115991 is about 1765.2169838295. The cubic root of 3115991 is about 146.0602584814.

The spelling of 3115991 in words is "three million, one hundred fifteen thousand, nine hundred ninety-one".