2501643 has 8 divisors (see below), whose sum is σ = 3343248. Its totient is φ = 1663904.

The previous prime is 2501623. The next prime is 2501647. The reversal of 2501643 is 3461052.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2501643 - 2⁹ = 2501131 is a prime.

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, 1321 + ... + 2597.

It is an arithmetic number, because the mean of its divisors is an integer number (417906).

2^2501643 is an apocalyptic number.

2501643 is a deficient number, since it is larger than the sum of its proper divisors (841605).

2501643 is a wasteful number, since it uses less digits than its factorization.

2501643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 2501643 is about 1581.6583069677. The cubic root of 2501643 is about 135.7506062398.

Adding to 2501643 its reverse (3461052), we get a palindrome (5962695).

The spelling of 2501643 in words is "two million, five hundred one thousand, six hundred forty-three".