18131029 has 6 divisors (see below), whose sum is σ = 21091254. Its totient is φ = 15540840.

The previous prime is 18131017. The next prime is 18131039. The reversal of 18131029 is 92013181.

It can be written as a sum of positive squares in only one way, i.e., 12794929 + 5336100 = 3577^2 + 2310^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18131029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18130994 and 18131012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18131039) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184962 + ... + 185059.

It is an arithmetic number, because the mean of its divisors is an integer number (3515209).

Almost surely, 2^18131029 is an apocalyptic number.

It is an amenable number.

18131029 is a deficient number, since it is larger than the sum of its proper divisors (2960225).

18131029 is an equidigital number, since it uses as much as digits as its factorization.

18131029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370035 (or 370028 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 18131029 is about 4258.0546027499. The cubic root of 18131029 is about 262.7085158039.

The spelling of 18131029 in words is "eighteen million, one hundred thirty-one thousand, twenty-nine".