18631241 has 2 divisors, whose sum is σ = 18631242. Its totient is φ = 18631240.

The previous prime is 18631231. The next prime is 18631243. The reversal of 18631241 is 14213681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15405625 + 3225616 = 3925^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 18631241 - 2¹⁰ = 18630217 is a prime.

Together with 18631243, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p_1189025 and since 18631241 and 1189025 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18631241.

It is not a weakly prime, because it can be changed into another prime (18631243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9315620 + 9315621.

It is an arithmetic number, because the mean of its divisors is an integer number (9315621).

Almost surely, 2^18631241 is an apocalyptic number.

It is an amenable number.

18631241 is a deficient number, since it is larger than the sum of its proper divisors (1).

18631241 is an equidigital number, since it uses as much as digits as its factorization.

18631241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1152, while the sum is 26.

The square root of 18631241 is about 4316.3921276918. The cubic root of 18631241 is about 265.1025638355.

The spelling of 18631241 in words is "eighteen million, six hundred thirty-one thousand, two hundred forty-one".