3100991 has 2 divisors, whose sum is σ = 3100992. Its totient is φ = 3100990.

The previous prime is 3100957. The next prime is 3101029. The reversal of 3100991 is 1990013.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3100991 - 2⁶ = 3100927 is a prime.

It is a super-2 number, since 2×3100991² = 19232290364162, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3108991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1550495 + 1550496.

It is an arithmetic number, because the mean of its divisors is an integer number (1550496).

Almost surely, 2^3100991 is an apocalyptic number.

3100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

3100991 is an equidigital number, since it uses as much as digits as its factorization.

3100991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 3100991 is about 1760.9630887671. The cubic root of 3100991 is about 145.8255093127.

The spelling of 3100991 in words is "three million, one hundred thousand, nine hundred ninety-one".