2551906 has 8 divisors (see below), whose sum is σ = 4374720. Its totient is φ = 1093668.

The previous prime is 2551903. The next prime is 2551933. The reversal of 2551906 is 6091552.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2551903) 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, 91126 + ... + 91153.

It is an arithmetic number, because the mean of its divisors is an integer number (546840).

2^2551906 is an apocalyptic number.

2551906 is a deficient number, since it is larger than the sum of its proper divisors (1822814).

2551906 is a wasteful number, since it uses less digits than its factorization.

2551906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182288.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 2551906 is about 1597.4686225400. The cubic root of 2551906 is about 136.6537511755.

The spelling of 2551906 in words is "two million, five hundred fifty-one thousand, nine hundred six".