228531931291 has 4 divisors (see below), whose sum is σ = 228609219312. Its totient is φ = 228454643272.

The previous prime is 228531931259. The next prime is 228531931337. The reversal of 228531931291 is 192139135822.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192139135822 = 2 ⋅96069567911.

It is a cyclic number.

It is not a de Polignac number, because 228531931291 - 2⁵ = 228531931259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228531931231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38639575 + ... + 38645488.

It is an arithmetic number, because the mean of its divisors is an integer number (57152304828).

Almost surely, 2^228531931291 is an apocalyptic number.

228531931291 is a deficient number, since it is larger than the sum of its proper divisors (77288021).

228531931291 is an equidigital number, since it uses as much as digits as its factorization.

228531931291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77288020.

The product of its digits is 233280, while the sum is 46.

The spelling of 228531931291 in words is "two hundred twenty-eight billion, five hundred thirty-one million, nine hundred thirty-one thousand, two hundred ninety-one".