231020231 has 4 divisors (see below), whose sum is σ = 248791032. Its totient is φ = 213249432.

The previous prime is 231020197. The next prime is 231020233. The reversal of 231020231 is 132020132.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 231020231 - 2¹⁰ = 231019207 is a prime.

It is a super-2 number, since 2×231020231² = 106740694262586722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231020233) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8885381 + ... + 8885406.

It is an arithmetic number, because the mean of its divisors is an integer number (62197758).

Almost surely, 2^231020231 is an apocalyptic number.

231020231 is a deficient number, since it is larger than the sum of its proper divisors (17770801).

231020231 is a wasteful number, since it uses less digits than its factorization.

231020231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17770800.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 231020231 is about 15199.3496900361. The cubic root of 231020231 is about 613.5971558844.

Adding to 231020231 its reverse (132020132), we get a palindrome (363040363).

Subtracting from 231020231 its reverse (132020132), we obtain a palindrome (99000099).

The spelling of 231020231 in words is "two hundred thirty-one million, twenty thousand, two hundred thirty-one".