18271739929 has 3 divisors (see below), whose sum is σ = 18271875103. Its totient is φ = 18271604756.

The previous prime is 18271739903. The next prime is 18271739939. The reversal of 18271739929 is 92993717281.

The square root of 18271739929 is 135173.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 18010982025 + 260757904 = 134205^2 + 16148^2 .

It is not a de Polignac number, because 18271739929 - 2²¹ = 18269642777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18271739939) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 67587 + ... + 202759.

Almost surely, 2^18271739929 is an apocalyptic number.

18271739929 is the 135173-rd square number.

18271739929 is the 67587-th centered octagonal number.

It is an amenable number.

18271739929 is a deficient number, since it is larger than the sum of its proper divisors (135174).

18271739929 is an frugal number, since it uses more digits than its factorization.

18271739929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270346 (or 135173 counting only the distinct ones).

The product of its digits is 3429216, while the sum is 58.

The spelling of 18271739929 in words is "eighteen billion, two hundred seventy-one million, seven hundred thirty-nine thousand, nine hundred twenty-nine".