231311403 has 16 divisors (see below), whose sum is σ = 347800960. Its totient is φ = 151904808.

The previous prime is 231311389. The next prime is 231311417. The reversal of 231311403 is 304113132.

231311403 is a `hidden beast` number, since 231 + 31 + 1 + 403 = 666.

It is an interprime number because it is at equal distance from previous prime (231311389) and next prime (231311417).

It is not a de Polignac number, because 231311403 - 2⁵ = 231311371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231311473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62125 + ... + 65742.

It is an arithmetic number, because the mean of its divisors is an integer number (21737560).

Almost surely, 2^231311403 is an apocalyptic number.

231311403 is a deficient number, since it is larger than the sum of its proper divisors (116489557).

231311403 is a wasteful number, since it uses less digits than its factorization.

231311403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127943 (or 127937 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

The square root of 231311403 is about 15208.9251099478. The cubic root of 231311403 is about 613.8548350529.

Adding to 231311403 its reverse (304113132), we get a palindrome (535424535).

The spelling of 231311403 in words is "two hundred thirty-one million, three hundred eleven thousand, four hundred three".