2881235781 has 12 divisors (see below), whose sum is σ = 4214466880. Its totient is φ = 1896509160.

The previous prime is 2881235779. The next prime is 2881235801. The reversal of 2881235781 is 1875321882.

2881235781 is a `hidden beast` number, since 288 + 12 + 357 + 8 + 1 = 666.

It is not a de Polignac number, because 2881235781 - 2¹ = 2881235779 is a prime.

It is a super-2 number, since 2×2881235781² = 16603039251429359922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2881235711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2025475 + ... + 2026896.

Almost surely, 2^2881235781 is an apocalyptic number.

It is an amenable number.

2881235781 is a deficient number, since it is larger than the sum of its proper divisors (1333231099).

2881235781 is a wasteful number, since it uses less digits than its factorization.

2881235781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4052456 (or 4052453 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 2881235781 is about 53677.1439348257. The cubic root of 2881235781 is about 1422.9607899728.

The spelling of 2881235781 in words is "two billion, eight hundred eighty-one million, two hundred thirty-five thousand, seven hundred eighty-one".