2549851 has 4 divisors (see below), whose sum is σ = 2559600. Its totient is φ = 2540104.

The previous prime is 2549821. The next prime is 2549863. The reversal of 2549851 is 1589452.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2549851 is a prime.

It is an Ulam number.

It is a Duffinian number.

2549851 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2549801) 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, 4471 + ... + 5008.

It is an arithmetic number, because the mean of its divisors is an integer number (639900).

2^2549851 is an apocalyptic number.

2549851 is a deficient number, since it is larger than the sum of its proper divisors (9749).

2549851 is an equidigital number, since it uses as much as digits as its factorization.

2549851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9748.

The product of its digits is 14400, while the sum is 34.

The square root of 2549851 is about 1596.8252878759. The cubic root of 2549851 is about 136.6170597936.

The spelling of 2549851 in words is "two million, five hundred forty-nine thousand, eight hundred fifty-one".