1123188197 has 4 divisors (see below), whose sum is σ = 1123595436. Its totient is φ = 1122780960.

The previous prime is 1123188193. The next prime is 1123188217. The reversal of 1123188197 is 7918813211.

It is a Cunningham number, because it is equal to 33514²+1.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7918813211 = 45247 ⋅175013.

It can be written as a sum of positive squares in 2 ways, for example, as 174609796 + 948578401 = 13214^2 + 30799^2 .

It is a cyclic number.

It is not a de Polignac number, because 1123188197 - 2² = 1123188193 is a prime.

It is a super-2 number, since 2×1123188197² = 2523103451760221618, 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 (1123188193) 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, 199454 + ... + 205007.

It is an arithmetic number, because the mean of its divisors is an integer number (280898859).

Almost surely, 2^1123188197 is an apocalyptic number.

It is an amenable number.

1123188197 is a deficient number, since it is larger than the sum of its proper divisors (407239).

1123188197 is an equidigital number, since it uses as much as digits as its factorization.

1123188197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 407238.

The product of its digits is 24192, while the sum is 41.

The square root of 1123188197 is about 33514.0000149191. Note that the first 4 decimals coincide. The cubic root of 1123188197 is about 1039.4832852923.

The spelling of 1123188197 in words is "one billion, one hundred twenty-three million, one hundred eighty-eight thousand, one hundred ninety-seven".