231203431 has 4 divisors (see below), whose sum is σ = 231297664. Its totient is φ = 231109200.

The previous prime is 231203407. The next prime is 231203471. The reversal of 231203431 is 134302132.

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 231203431 - 2⁹ = 231202919 is a prime.

It is a super-2 number, since 2×231203431² = 106910053012343522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231203399 and 231203408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231203471) 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, 43335 + ... + 48376.

It is an arithmetic number, because the mean of its divisors is an integer number (57824416).

Almost surely, 2^231203431 is an apocalyptic number.

231203431 is a deficient number, since it is larger than the sum of its proper divisors (94233).

231203431 is an equidigital number, since it uses as much as digits as its factorization.

231203431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94232.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 231203431 is about 15205.3750693628. The cubic root of 231203431 is about 613.7593080582.

Adding to 231203431 its reverse (134302132), we get a palindrome (365505563).

The spelling of 231203431 in words is "two hundred thirty-one million, two hundred three thousand, four hundred thirty-one".