2731009 has 4 divisors (see below), whose sum is σ = 2735316. Its totient is φ = 2726704.

The previous prime is 2730991. The next prime is 2731013. The reversal of 2731009 is 9001372.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1113025 + 1617984 = 1055^2 + 1272^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2731009 is a prime.

It is a Duffinian number.

2731009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2731049) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 994 + ... + 2539.

It is an arithmetic number, because the mean of its divisors is an integer number (683829).

2^2731009 is an apocalyptic number.

It is an amenable number.

2731009 is a deficient number, since it is larger than the sum of its proper divisors (4307).

2731009 is an equidigital number, since it uses as much as digits as its factorization.

2731009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306.

The product of its (nonzero) digits is 378, while the sum is 22.

The square root of 2731009 is about 1652.5764732683. The cubic root of 2731009 is about 139.7787150456.

The spelling of 2731009 in words is "two million, seven hundred thirty-one thousand, nine".