18634129 has 2 divisors, whose sum is σ = 18634130. Its totient is φ = 18634128.

The previous prime is 18634127. The next prime is 18634139. The reversal of 18634129 is 92143681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 2634129 = 4000^2 + 1623^2 .

It is a cyclic number.

It is not a de Polignac number, because 18634129 - 2¹ = 18634127 is a prime.

Together with 18634127, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 18634094 and 18634103.

It is not a weakly prime, because it can be changed into another prime (18634127) 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 as a sum of consecutive naturals, namely, 9317064 + 9317065.

It is an arithmetic number, because the mean of its divisors is an integer number (9317065).

Almost surely, 2^18634129 is an apocalyptic number.

It is an amenable number.

18634129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18634129 is an equidigital number, since it uses as much as digits as its factorization.

18634129 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10368, while the sum is 34.

The square root of 18634129 is about 4316.7266533799. The cubic root of 18634129 is about 265.1162608413.

The spelling of 18634129 in words is "eighteen million, six hundred thirty-four thousand, one hundred twenty-nine".