231011231 has 4 divisors (see below), whose sum is σ = 252012264. Its totient is φ = 210010200.

The previous prime is 231011227. The next prime is 231011237. The reversal of 231011231 is 132110132.

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 231011231 - 2² = 231011227 is a prime.

It is a super-2 number, since 2×231011231² = 106732377696270722, 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 (231011237) 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, 10500500 + ... + 10500521.

It is an arithmetic number, because the mean of its divisors is an integer number (63003066).

Almost surely, 2^231011231 is an apocalyptic number.

231011231 is a deficient number, since it is larger than the sum of its proper divisors (21001033).

231011231 is a wasteful number, since it uses less digits than its factorization.

231011231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21001032.

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 231011231 is about 15199.0536218542. The cubic root of 231011231 is about 613.5891876845.

Adding to 231011231 its reverse (132110132), we get a palindrome (363121363).

The spelling of 231011231 in words is "two hundred thirty-one million, eleven thousand, two hundred thirty-one".