18504953 has 2 divisors, whose sum is σ = 18504954. Its totient is φ = 18504952.

The previous prime is 18504919. The next prime is 18504961. The reversal of 18504953 is 35940581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16581184 + 1923769 = 4072^2 + 1387^2 .

It is a cyclic number.

It is not a de Polignac number, because 18504953 - 2²⁰ = 17456377 is a prime.

It is not a weakly prime, because it can be changed into another prime (18504973) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9252476 + 9252477.

It is an arithmetic number, because the mean of its divisors is an integer number (9252477).

Almost surely, 2^18504953 is an apocalyptic number.

It is an amenable number.

18504953 is a deficient number, since it is larger than the sum of its proper divisors (1).

18504953 is an equidigital number, since it uses as much as digits as its factorization.

18504953 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 18504953 is about 4301.7383695432. The cubic root of 18504953 is about 264.5022244588.

The spelling of 18504953 in words is "eighteen million, five hundred four thousand, nine hundred fifty-three".