2551606 has 4 divisors (see below), whose sum is σ = 3827412. Its totient is φ = 1275802.

The previous prime is 2551603. The next prime is 2551607. The reversal of 2551606 is 6061552.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2551603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637900 + ... + 637903.

It is an arithmetic number, because the mean of its divisors is an integer number (956853).

2^2551606 is an apocalyptic number.

2551606 is a deficient number, since it is larger than the sum of its proper divisors (1275806).

2551606 is a wasteful number, since it uses less digits than its factorization.

2551606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1275805.

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

The square root of 2551606 is about 1597.3747212223. The cubic root of 2551606 is about 136.6483959976.

The spelling of 2551606 in words is "two million, five hundred fifty-one thousand, six hundred six".