1118772181 has 4 divisors (see below), whose sum is σ = 1119081600. Its totient is φ = 1118462764.

The previous prime is 1118772173. The next prime is 1118772197. The reversal of 1118772181 is 1812778111.

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: 1812778111 = 37 ⋅48994003.

It is a cyclic number.

It is not a de Polignac number, because 1118772181 - 2³ = 1118772173 is a prime.

It is a super-2 number, since 2×1118772181² = 2503302385958993522, which contains 22 as substring.

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 1118772181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1118772131) 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 3 ways as a sum of consecutive naturals, for example, 149221 + ... + 156538.

It is an arithmetic number, because the mean of its divisors is an integer number (279770400).

Almost surely, 2^1118772181 is an apocalyptic number.

It is an amenable number.

1118772181 is a deficient number, since it is larger than the sum of its proper divisors (309419).

1118772181 is an equidigital number, since it uses as much as digits as its factorization.

1118772181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309418.

The product of its digits is 6272, while the sum is 37.

The square root of 1118772181 is about 33448.0519761615. The cubic root of 1118772181 is about 1038.1191909616.

The spelling of 1118772181 in words is "one billion, one hundred eighteen million, seven hundred seventy-two thousand, one hundred eighty-one".