187474278289 has 3 divisors (see below), whose sum is σ = 187474711273. Its totient is φ = 187473845306.

The previous prime is 187474278283. The next prime is 187474278337. The reversal of 187474278289 is 982872474781.

The square root of 187474278289 is 432983.

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 is not a de Polignac number, because 187474278289 - 2³ = 187474278281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (187474278281) 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, 216492 + ... + 649474.

Almost surely, 2^187474278289 is an apocalyptic number.

187474278289 is the 432983-rd square number.

187474278289 is the 216492-nd centered octagonal number.

It is an amenable number.

187474278289 is a deficient number, since it is larger than the sum of its proper divisors (432984).

187474278289 is an frugal number, since it uses more digits than its factorization.

187474278289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 865966 (or 432983 counting only the distinct ones).

The product of its digits is 101154816, while the sum is 67.

The spelling of 187474278289 in words is "one hundred eighty-seven billion, four hundred seventy-four million, two hundred seventy-eight thousand, two hundred eighty-nine".