2991409 has 4 divisors (see below), whose sum is σ = 3055104. Its totient is φ = 2927716.

The previous prime is 2991397. The next prime is 2991421. The reversal of 2991409 is 9041992.

2991409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2991397) and next prime (2991421).

It is a cyclic number.

It is not a de Polignac number, because 2991409 - 2⁵ = 2991377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2997409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31777 + ... + 31870.

It is an arithmetic number, because the mean of its divisors is an integer number (763776).

2^2991409 is an apocalyptic number.

It is an amenable number.

2991409 is a deficient number, since it is larger than the sum of its proper divisors (63695).

2991409 is an equidigital number, since it uses as much as digits as its factorization.

2991409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63694.

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 2991409 is about 1729.5690214617. The cubic root of 2991409 is about 144.0871546729.

The spelling of 2991409 in words is "two million, nine hundred ninety-one thousand, four hundred nine".