2531909 has 4 divisors (see below), whose sum is σ = 2642016. Its totient is φ = 2421804.

The previous prime is 2531891. The next prime is 2531917. The reversal of 2531909 is 9091352.

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 a cyclic number.

It is not a de Polignac number, because 2531909 - 2⁸ = 2531653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2531989) 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, 55019 + ... + 55064.

It is an arithmetic number, because the mean of its divisors is an integer number (660504).

2^2531909 is an apocalyptic number.

It is an amenable number.

2531909 is a deficient number, since it is larger than the sum of its proper divisors (110107).

2531909 is a wasteful number, since it uses less digits than its factorization.

2531909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110106.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 2531909 is about 1591.1973479113. The cubic root of 2531909 is about 136.2958704236.

The spelling of 2531909 in words is "two million, five hundred thirty-one thousand, nine hundred nine".