18661113 has 6 divisors (see below), whose sum is σ = 26954954. Its totient is φ = 12440736.

The previous prime is 18661099. The next prime is 18661129. The reversal of 18661113 is 31116681.

It can be written as a sum of positive squares in only one way, i.e., 16621929 + 2039184 = 4077^2 + 1428^2 .

It is not a de Polignac number, because 18661113 - 2⁸ = 18660857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18661133) 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, 1036720 + ... + 1036737.

Almost surely, 2^18661113 is an apocalyptic number.

It is an amenable number.

18661113 is a deficient number, since it is larger than the sum of its proper divisors (8293841).

18661113 is a wasteful number, since it uses less digits than its factorization.

18661113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2073463 (or 2073460 counting only the distinct ones).

The product of its digits is 864, while the sum is 27.

The square root of 18661113 is about 4319.8510390985. The cubic root of 18661113 is about 265.2441703487.

Adding to 18661113 its reverse (31116681), we get a palindrome (49777794).

It can be divided in two parts, 186611 and 13, that added together give a square (186624 = 432²).

The spelling of 18661113 in words is "eighteen million, six hundred sixty-one thousand, one hundred thirteen".