231403331 has 4 divisors (see below), whose sum is σ = 231483000. Its totient is φ = 231323664.

The previous prime is 231403301. The next prime is 231403349. The reversal of 231403331 is 133304132.

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 231403331 - 2¹⁸ = 231141187 is a prime.

It is a super-2 number, since 2×231403331² = 107095003195791122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231403301) 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, 35306 + ... + 41343.

It is an arithmetic number, because the mean of its divisors is an integer number (57870750).

Almost surely, 2^231403331 is an apocalyptic number.

231403331 is a deficient number, since it is larger than the sum of its proper divisors (79669).

231403331 is an equidigital number, since it uses as much as digits as its factorization.

231403331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79668.

The product of its (nonzero) digits is 648, while the sum is 20.

The square root of 231403331 is about 15211.9469825529. The cubic root of 231403331 is about 613.9361438754.

Adding to 231403331 its reverse (133304132), we get a palindrome (364707463).

The spelling of 231403331 in words is "two hundred thirty-one million, four hundred three thousand, three hundred thirty-one".