187812157129 has 3 divisors (see below), whose sum is σ = 187812590503. Its totient is φ = 187811723756.

The previous prime is 187812157073. The next prime is 187812157189. The reversal of 187812157129 is 921751218781.

The square root of 187812157129 is 433373.

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, and also an emirpimes, since its reverse is a distinct semiprime: 921751218781 = 23 ⋅40076139947.

It can be written as a sum of positive squares in only one way, i.e., 65415735225 + 122396421904 = 255765^2 + 349852^2 .

It is not a de Polignac number, because 187812157129 - 2¹¹ = 187812155081 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187812157189) 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, 216687 + ... + 650059.

Almost surely, 2^187812157129 is an apocalyptic number.

187812157129 is the 433373-rd square number.

187812157129 is the 216687-th centered octagonal number.

It is an amenable number.

187812157129 is a deficient number, since it is larger than the sum of its proper divisors (433374).

187812157129 is an frugal number, since it uses more digits than its factorization.

187812157129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 866746 (or 433373 counting only the distinct ones).

The product of its digits is 564480, while the sum is 52.

The spelling of 187812157129 in words is "one hundred eighty-seven billion, eight hundred twelve million, one hundred fifty-seven thousand, one hundred twenty-nine".