231820887 has 16 divisors (see below), whose sum is σ = 328624128. Its totient is φ = 145036320.

The previous prime is 231820829. The next prime is 231820903. The reversal of 231820887 is 788028132.

It is not a de Polignac number, because 231820887 - 2¹⁹ = 231296599 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231820817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28039 + ... + 35352.

It is an arithmetic number, because the mean of its divisors is an integer number (20539008).

Almost surely, 2^231820887 is an apocalyptic number.

231820887 is a deficient number, since it is larger than the sum of its proper divisors (96803241).

231820887 is a wasteful number, since it uses less digits than its factorization.

231820887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63470.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 231820887 is about 15225.6654041786. The cubic root of 231820887 is about 614.3051945740.

The spelling of 231820887 in words is "two hundred thirty-one million, eight hundred twenty thousand, eight hundred eighty-seven".