231028831 has 4 divisors (see below), whose sum is σ = 252031464. Its totient is φ = 210026200.

The previous prime is 231028823. The next prime is 231028841. The reversal of 231028831 is 138820132.

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 231028831 - 2³ = 231028823 is a prime.

It is a super-2 number, since 2×231028831² = 106748641506453122, which contains 22 as substring.

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 231028831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231028841) 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, 10501300 + ... + 10501321.

It is an arithmetic number, because the mean of its divisors is an integer number (63007866).

Almost surely, 2^231028831 is an apocalyptic number.

231028831 is a deficient number, since it is larger than the sum of its proper divisors (21002633).

231028831 is a wasteful number, since it uses less digits than its factorization.

231028831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21002632.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 231028831 is about 15199.6325942438. The cubic root of 231028831 is about 613.6047697487.

Adding to 231028831 its reverse (138820132), we get a palindrome (369848963).

The spelling of 231028831 in words is "two hundred thirty-one million, twenty-eight thousand, eight hundred thirty-one".