2573509 has 2 divisors, whose sum is σ = 2573510. Its totient is φ = 2573508.

The previous prime is 2573491. The next prime is 2573533. The reversal of 2573509 is 9053752.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1768900 + 804609 = 1330^2 + 897^2 .

It is a cyclic number.

It is not a de Polignac number, because 2573509 - 2¹¹ = 2571461 is a prime.

It is a super-3 number, since 3×2573509³ = 51132653278083333687, which contains 333 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2573209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1286754 + 1286755.

It is an arithmetic number, because the mean of its divisors is an integer number (1286755).

2^2573509 is an apocalyptic number.

It is an amenable number.

2573509 is a deficient number, since it is larger than the sum of its proper divisors (1).

2573509 is an equidigital number, since it uses as much as digits as its factorization.

2573509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9450, while the sum is 31.

The square root of 2573509 is about 1604.2160078992. The cubic root of 2573509 is about 137.0382793916.

The spelling of 2573509 in words is "two million, five hundred seventy-three thousand, five hundred nine".