2543651 has 4 divisors (see below), whose sum is σ = 2774904. Its totient is φ = 2312400.

The previous prime is 2543647. The next prime is 2543657. The reversal of 2543651 is 1563452.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2543651 - 2² = 2543647 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2543651.

It is not an unprimeable number, because it can be changed into a prime (2543657) 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, 115610 + ... + 115631.

It is an arithmetic number, because the mean of its divisors is an integer number (693726).

2^2543651 is an apocalyptic number.

2543651 is a deficient number, since it is larger than the sum of its proper divisors (231253).

2543651 is a wasteful number, since it uses less digits than its factorization.

2543651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 231252.

The product of its digits is 3600, while the sum is 26.

The square root of 2543651 is about 1594.8827543114. The cubic root of 2543651 is about 136.5062411330.

The spelling of 2543651 in words is "two million, five hundred forty-three thousand, six hundred fifty-one".