2607991 has 2 divisors, whose sum is σ = 2607992. Its totient is φ = 2607990.

The previous prime is 2607989. The next prime is 2608007. The reversal of 2607991 is 1997062.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2607991 - 2¹ = 2607989 is a prime.

Together with 2607989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2607491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1303995 + 1303996.

It is an arithmetic number, because the mean of its divisors is an integer number (1303996).

2^2607991 is an apocalyptic number.

2607991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2607991 is an equidigital number, since it uses as much as digits as its factorization.

2607991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 2607991 is about 1614.9275525546. The cubic root of 2607991 is about 137.6476166722.

The spelling of 2607991 in words is "two million, six hundred seven thousand, nine hundred ninety-one".