231184987489 has 9 divisors (see below), whose sum is σ = 232141416273. Its totient is φ = 230232489012.

The previous prime is 231184987469. The next prime is 231184987543. The reversal of 231184987489 is 984789481132.

The square root of 231184987489 is 480817.

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

It is not a de Polignac number, because 231184987489 - 2⁷ = 231184987361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 231184987489.

It is not an unprimeable number, because it can be changed into a prime (231184987469) 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, 136070362 + ... + 136072060.

It is an arithmetic number, because the mean of its divisors is an integer number (25793490697).

Almost surely, 2^231184987489 is an apocalyptic number.

231184987489 is the 480817-th square number.

231184987489 is the 240409-th centered octagonal number.

It is an amenable number.

231184987489 is a deficient number, since it is larger than the sum of its proper divisors (956428784).

231184987489 is an frugal number, since it uses more digits than its factorization.

231184987489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964 (or 1982 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 64.

Multiplying 231184987489 by its sum of digits (64), we get a square (14795839199296 = 3846536²).

The spelling of 231184987489 in words is "two hundred thirty-one billion, one hundred eighty-four million, nine hundred eighty-seven thousand, four hundred eighty-nine".