2643551 has 8 divisors (see below), whose sum is σ = 2921184. Its totient is φ = 2379520.

The previous prime is 2643547. The next prime is 2643559. The reversal of 2643551 is 1553462.

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 2643551 - 2² = 2643547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2643551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2643559) 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, 2990 + ... + 3771.

It is an arithmetic number, because the mean of its divisors is an integer number (365148).

2^2643551 is an apocalyptic number.

2643551 is a deficient number, since it is larger than the sum of its proper divisors (277633).

2643551 is a wasteful number, since it uses less digits than its factorization.

2643551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6801.

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

The square root of 2643551 is about 1625.9000584292. The cubic root of 2643551 is about 138.2704037893.

The spelling of 2643551 in words is "two million, six hundred forty-three thousand, five hundred fifty-one".