2238778181 has 4 divisors (see below), whose sum is σ = 2310996864. Its totient is φ = 2166559500.

The previous prime is 2238778169. The next prime is 2238778183. The reversal of 2238778181 is 1818778322.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1818778322 = 2 ⋅909389161.

It is a cyclic number.

It is not a de Polignac number, because 2238778181 - 2¹⁸ = 2238516037 is a prime.

It is a super-2 number, since 2×2238778181² = 10024255487443337522, 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 (2238778183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36109295 + ... + 36109356.

It is an arithmetic number, because the mean of its divisors is an integer number (577749216).

Almost surely, 2^2238778181 is an apocalyptic number.

It is an amenable number.

2238778181 is a deficient number, since it is larger than the sum of its proper divisors (72218683).

2238778181 is an equidigital number, since it uses as much as digits as its factorization.

2238778181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72218682.

The product of its digits is 301056, while the sum is 47.

The square root of 2238778181 is about 47315.7286850789. The cubic root of 2238778181 is about 1308.1885849175.

The spelling of 2238778181 in words is "two billion, two hundred thirty-eight million, seven hundred seventy-eight thousand, one hundred eighty-one".