2501645 has 8 divisors (see below), whose sum is σ = 3011040. Its totient is φ = 1995280.

The previous prime is 2501623. The next prime is 2501647. The reversal of 2501645 is 5461052.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2501645 - 2¹⁰ = 2500621 is a prime.

It is a super-3 number, since 3×2501645³ = 46967592148916733375, which contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2501645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2501647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1946 + ... + 2964.

It is an arithmetic number, because the mean of its divisors is an integer number (376380).

2^2501645 is an apocalyptic number.

It is an amenable number.

2501645 is a deficient number, since it is larger than the sum of its proper divisors (509395).

2501645 is a wasteful number, since it uses less digits than its factorization.

2501645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1515.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2501645 is about 1581.6589392154. The cubic root of 2501645 is about 135.7506424162.

Adding to 2501645 its reverse (5461052), we get a palindrome (7962697).

The spelling of 2501645 in words is "two million, five hundred one thousand, six hundred forty-five".