18761361 has 4 divisors (see below), whose sum is σ = 25015152. Its totient is φ = 12507572.

The previous prime is 18761333. The next prime is 18761363. The reversal of 18761361 is 16316781.

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.

It is a cyclic number.

It is not a de Polignac number, because 18761361 - 2²² = 14567057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18761363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3126891 + ... + 3126896.

It is an arithmetic number, because the mean of its divisors is an integer number (6253788).

Almost surely, 2^18761361 is an apocalyptic number.

It is an amenable number.

18761361 is a deficient number, since it is larger than the sum of its proper divisors (6253791).

18761361 is an equidigital number, since it uses as much as digits as its factorization.

18761361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6253790.

The product of its digits is 6048, while the sum is 33.

The square root of 18761361 is about 4331.4386755442. The cubic root of 18761361 is about 265.7182886353.

The spelling of 18761361 in words is "eighteen million, seven hundred sixty-one thousand, three hundred sixty-one".