2549781 has 48 divisors (see below), whose sum is σ = 4426240. Its totient is φ = 1399680.

The previous prime is 2549773. The next prime is 2549783. The reversal of 2549781 is 1879452.

It is not a de Polignac number, because 2549781 - 2³ = 2549773 is a prime.

It is a super-2 number, since 2×2549781² = 13002766295922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2549783) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 68895 + ... + 68931.

2^2549781 is an apocalyptic number.

It is an amenable number.

2549781 is a deficient number, since it is larger than the sum of its proper divisors (1876459).

2549781 is a wasteful number, since it uses less digits than its factorization.

2549781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 103 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 2549781 is about 1596.8033692349. The cubic root of 2549781 is about 136.6158096184.

The spelling of 2549781 in words is "two million, five hundred forty-nine thousand, seven hundred eighty-one".