2551206 has 64 divisors (see below), whose sum is σ = 6451200. Its totient is φ = 655776.

The previous prime is 2551177. The next prime is 2551223. The reversal of 2551206 is 6021552.

2551206 = T₁₈₈ + T₁₈₉ + ... + T₂₇₉.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18285 + ... + 18423.

It is an arithmetic number, because the mean of its divisors is an integer number (100800).

2^2551206 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2551206, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3225600).

2551206 is an abundant number, since it is smaller than the sum of its proper divisors (3899994).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2551206 is a wasteful number, since it uses less digits than its factorization.

2551206 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 2551206 is about 1597.2495108780. The cubic root of 2551206 is about 136.6412551074.

Adding to 2551206 its reverse (6021552), we get a palindrome (8572758).

The spelling of 2551206 in words is "two million, five hundred fifty-one thousand, two hundred six".