2581573 has 2 divisors, whose sum is σ = 2581574. Its totient is φ = 2581572.

The previous prime is 2581561. The next prime is 2581583. The reversal of 2581573 is 3751852.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1803649 + 777924 = 1343^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 2581573 - 2⁵ = 2581541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2581583) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1290786 + 1290787.

It is an arithmetic number, because the mean of its divisors is an integer number (1290787).

2^2581573 is an apocalyptic number.

It is an amenable number.

2581573 is a deficient number, since it is larger than the sum of its proper divisors (1).

2581573 is an equidigital number, since it uses as much as digits as its factorization.

2581573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8400, while the sum is 31.

The square root of 2581573 is about 1606.7274193216. The cubic root of 2581573 is about 137.1812650259.

The spelling of 2581573 in words is "two million, five hundred eighty-one thousand, five hundred seventy-three".