18031129 has 2 divisors, whose sum is σ = 18031130. Its totient is φ = 18031128.

The previous prime is 18031121. The next prime is 18031141. The reversal of 18031129 is 92113081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10413529 + 7617600 = 3227^2 + 2760^2 .

It is a cyclic number.

It is not a de Polignac number, because 18031129 - 2³ = 18031121 is a prime.

It is a super-2 number, since 2×18031129² = 650243226029282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18031121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9015564 + 9015565.

It is an arithmetic number, because the mean of its divisors is an integer number (9015565).

Almost surely, 2^18031129 is an apocalyptic number.

It is an amenable number.

18031129 is a deficient number, since it is larger than the sum of its proper divisors (1).

18031129 is an equidigital number, since it uses as much as digits as its factorization.

18031129 is an odious number, because the sum of its binary digits is odd.

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

The square root of 18031129 is about 4246.3076902175. The cubic root of 18031129 is about 262.2251284497.

The spelling of 18031129 in words is "eighteen million, thirty-one thousand, one hundred twenty-nine".