2505145 has 4 divisors (see below), whose sum is σ = 3006180. Its totient is φ = 2004112.

The previous prime is 2505143. The next prime is 2505157. The reversal of 2505145 is 5415052.

2505145 is nontrivially palindromic in base 9.

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 553536 + 1951609 = 744^2 + 1397^2 .

It is a cyclic number.

It is not a de Polignac number, because 2505145 - 2¹ = 2505143 is a prime.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (2505143) 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, 250510 + ... + 250519.

It is an arithmetic number, because the mean of its divisors is an integer number (751545).

2^2505145 is an apocalyptic number.

It is an amenable number.

2505145 is a deficient number, since it is larger than the sum of its proper divisors (501035).

2505145 is an equidigital number, since it uses as much as digits as its factorization.

2505145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501034.

The product of its (nonzero) digits is 1000, while the sum is 22.

The square root of 2505145 is about 1582.7649857133. The cubic root of 2505145 is about 135.8139215572.

The spelling of 2505145 in words is "two million, five hundred five thousand, one hundred forty-five".