2781122781 has 8 divisors (see below), whose sum is σ = 3709014624. Its totient is φ = 1853656400.

The previous prime is 2781122779. The next prime is 2781122833. The reversal of 2781122781 is 1872211872.

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

It is a cyclic number.

It is not a de Polignac number, because 2781122781 - 2¹ = 2781122779 is a prime.

It is a super-2 number, since 2×2781122781² = 15469287845994347922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781121781) 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, 90786 + ... + 117491.

It is an arithmetic number, because the mean of its divisors is an integer number (463626828).

Almost surely, 2^2781122781 is an apocalyptic number.

It is an amenable number.

2781122781 is a deficient number, since it is larger than the sum of its proper divisors (927891843).

2781122781 is a wasteful number, since it uses less digits than its factorization.

2781122781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212731.

The product of its digits is 25088, while the sum is 39.

The square root of 2781122781 is about 52736.3516087338. The cubic root of 2781122781 is about 1406.2851394913.

The spelling of 2781122781 in words is "two billion, seven hundred eighty-one million, one hundred twenty-two thousand, seven hundred eighty-one".