18129413 has 2 divisors, whose sum is σ = 18129414. Its totient is φ = 18129412.

The previous prime is 18129409. The next prime is 18129427. The reversal of 18129413 is 31492181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15108769 + 3020644 = 3887^2 + 1738^2 .

It is a cyclic number.

It is not a de Polignac number, because 18129413 - 2² = 18129409 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18129443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9064706 + 9064707.

It is an arithmetic number, because the mean of its divisors is an integer number (9064707).

Almost surely, 2^18129413 is an apocalyptic number.

It is an amenable number.

18129413 is a deficient number, since it is larger than the sum of its proper divisors (1).

18129413 is an equidigital number, since it uses as much as digits as its factorization.

18129413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728, while the sum is 29.

The square root of 18129413 is about 4257.8648405040. The cubic root of 18129413 is about 262.7007105920.

The spelling of 18129413 in words is "eighteen million, one hundred twenty-nine thousand, four hundred thirteen".