12115557 has 6 divisors (see below), whose sum is σ = 17500262. Its totient is φ = 8077032.

The previous prime is 12115553. The next prime is 12115561. The reversal of 12115557 is 75551121.

It is an interprime number because it is at equal distance from previous prime (12115553) and next prime (12115561).

It can be written as a sum of positive squares in only one way, i.e., 10929636 + 1185921 = 3306^2 + 1089^2 .

It is not a de Polignac number, because 12115557 - 2² = 12115553 is a prime.

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 12115557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12115553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 673078 + ... + 673095.

Almost surely, 2^12115557 is an apocalyptic number.

It is an amenable number.

12115557 is a deficient number, since it is larger than the sum of its proper divisors (5384705).

12115557 is a wasteful number, since it uses less digits than its factorization.

12115557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1346179 (or 1346176 counting only the distinct ones).

The product of its digits is 1750, while the sum is 27.

The square root of 12115557 is about 3480.7408694127. The cubic root of 12115557 is about 229.6753895878.

Adding to 12115557 its reverse (75551121), we get a palindrome (87666678).

The spelling of 12115557 in words is "twelve million, one hundred fifteen thousand, five hundred fifty-seven".