2549781236 has 6 divisors (see below), whose sum is σ = 4462117170. Its totient is φ = 1274890616.

The previous prime is 2549781197. The next prime is 2549781251. The reversal of 2549781236 is 6321879452.

It can be written as a sum of positive squares in only one way, i.e., 2475062500 + 74718736 = 49750^2 + 8644^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318722651 + ... + 318722658.

It is an arithmetic number, because the mean of its divisors is an integer number (743686195).

Almost surely, 2^2549781236 is an apocalyptic number.

It is an amenable number.

2549781236 is a deficient number, since it is larger than the sum of its proper divisors (1912335934).

2549781236 is a wasteful number, since it uses less digits than its factorization.

2549781236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 637445313 (or 637445311 counting only the distinct ones).

The product of its digits is 725760, while the sum is 47.

The square root of 2549781236 is about 50495.3585589804. The cubic root of 2549781236 is about 1366.1581383331.

The spelling of 2549781236 in words is "two billion, five hundred forty-nine million, seven hundred eighty-one thousand, two hundred thirty-six".