2991601 has 2 divisors, whose sum is σ = 2991602. Its totient is φ = 2991600.

The previous prime is 2991589. The next prime is 2991619. The reversal of 2991601 is 1061992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1825201 + 1166400 = 1351^2 + 1080^2 .

It is a cyclic number.

It is not a de Polignac number, because 2991601 - 2²¹ = 894449 is a prime.

It is a Chen prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2991601.

It is not a weakly prime, because it can be changed into another prime (2991631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1495800 + 1495801.

It is an arithmetic number, because the mean of its divisors is an integer number (1495801).

2^2991601 is an apocalyptic number.

It is an amenable number.

2991601 is a deficient number, since it is larger than the sum of its proper divisors (1).

2991601 is an equidigital number, since it uses as much as digits as its factorization.

2991601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 2991601 is about 1729.6245257281. The cubic root of 2991601 is about 144.0902372941.

The spelling of 2991601 in words is "two million, nine hundred ninety-one thousand, six hundred one".