2551881 has 8 divisors (see below), whose sum is σ = 3485664. Its totient is φ = 1659680.

The previous prime is 2551877. The next prime is 2551883. The reversal of 2551881 is 1881552.

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

It is not a de Polignac number, because 2551881 - 2² = 2551877 is a prime.

It is a super-2 number, since 2×2551881² = 13024193276322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2551883) 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, 10251 + ... + 10496.

It is an arithmetic number, because the mean of its divisors is an integer number (435708).

2^2551881 is an apocalyptic number.

It is an amenable number.

2551881 is a deficient number, since it is larger than the sum of its proper divisors (933783).

2551881 is a wasteful number, since it uses less digits than its factorization.

2551881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20791.

The product of its digits is 3200, while the sum is 30.

The square root of 2551881 is about 1597.4607976411. The cubic root of 2551881 is about 136.6533049267.

The spelling of 2551881 in words is "two million, five hundred fifty-one thousand, eight hundred eighty-one".