2781307261 has 8 divisors (see below), whose sum is σ = 2840313248. Its totient is φ = 2722734000.

The previous prime is 2781307189. The next prime is 2781307301. The reversal of 2781307261 is 1627031872.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2781307261 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2781307261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781307561) 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, 95175 + ... + 120916.

It is an arithmetic number, because the mean of its divisors is an integer number (355039156).

Almost surely, 2^2781307261 is an apocalyptic number.

It is an amenable number.

2781307261 is a deficient number, since it is larger than the sum of its proper divisors (59005987).

2781307261 is a wasteful number, since it uses less digits than its factorization.

2781307261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216363.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 2781307261 is about 52738.1006578735. The cubic root of 2781307261 is about 1406.3162331379.

The spelling of 2781307261 in words is "two billion, seven hundred eighty-one million, three hundred seven thousand, two hundred sixty-one".