2238281781 has 4 divisors (see below), whose sum is σ = 2984375712. Its totient is φ = 1492187852.

The previous prime is 2238281779. The next prime is 2238281783. The reversal of 2238281781 is 1871828322.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (2238281779) and next prime (2238281783).

It is a cyclic number.

It is not a de Polignac number, because 2238281781 - 2¹ = 2238281779 is a prime.

It is a super-2 number, since 2×2238281781² = 10019810662313063922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2238281783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 373046961 + ... + 373046966.

It is an arithmetic number, because the mean of its divisors is an integer number (746093928).

Almost surely, 2^2238281781 is an apocalyptic number.

It is an amenable number.

2238281781 is a deficient number, since it is larger than the sum of its proper divisors (746093931).

2238281781 is an equidigital number, since it uses as much as digits as its factorization.

2238281781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 746093930.

The product of its digits is 86016, while the sum is 42.

The square root of 2238281781 is about 47310.4827813033. The cubic root of 2238281781 is about 1308.0918903871.

The spelling of 2238281781 in words is "two billion, two hundred thirty-eight million, two hundred eighty-one thousand, seven hundred eighty-one".