18941191129 has 9 divisors (see below), whose sum is σ = 22034751231. Its totient is φ = 16234480920.

The previous prime is 18941191123. The next prime is 18941191151. The reversal of 18941191129 is 92119114981.

The square root of 18941191129 is 137627.

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

It can be written as a sum of positive squares in only one way, i.e., 10532301129 + 8408890000 = 102627^2 + 91700^2 .

It is not a de Polignac number, because 18941191129 - 2⁵ = 18941191097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18941191123) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 953559 + ... + 973219.

Almost surely, 2^18941191129 is an apocalyptic number.

18941191129 is the 137627-th square number.

18941191129 is the 68814-th centered octagonal number.

It is an amenable number.

18941191129 is a deficient number, since it is larger than the sum of its proper divisors (3093560102).

18941191129 is an frugal number, since it uses more digits than its factorization.

18941191129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39336 (or 19668 counting only the distinct ones).

The product of its digits is 46656, while the sum is 46.

Multiplying 18941191129 by its product of digits (46656), we get a square (883720213314624 = 29727432²).

The spelling of 18941191129 in words is "eighteen billion, nine hundred forty-one million, one hundred ninety-one thousand, one hundred twenty-nine".