2506651 has 16 divisors (see below), whose sum is σ = 3087360. Its totient is φ = 1987200.

The previous prime is 2506649. The next prime is 2506657. The reversal of 2506651 is 1566052.

It is a cyclic number.

It is not a de Polignac number, because 2506651 - 2¹ = 2506649 is a prime.

It is an Ulam number.

It is a Duffinian number.

2506651 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2506657) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6051 + ... + 6451.

It is an arithmetic number, because the mean of its divisors is an integer number (192960).

2^2506651 is an apocalyptic number.

2506651 is a deficient number, since it is larger than the sum of its proper divisors (580709).

2506651 is a wasteful number, since it uses less digits than its factorization.

2506651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 2506651 is about 1583.2406639548. The cubic root of 2506651 is about 135.8411315315.

The spelling of 2506651 in words is "two million, five hundred six thousand, six hundred fifty-one".