231431133 has 8 divisors (see below), whose sum is σ = 313633696. Its totient is φ = 151758000.

The previous prime is 231431131. The next prime is 231431171. The reversal of 231431133 is 331134132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 231431133 - 2¹ = 231431131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231431131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 632143 + ... + 632508.

It is an arithmetic number, because the mean of its divisors is an integer number (39204212).

Almost surely, 2^231431133 is an apocalyptic number.

It is an amenable number.

231431133 is a deficient number, since it is larger than the sum of its proper divisors (82202563).

231431133 is a wasteful number, since it uses less digits than its factorization.

231431133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1264715.

The product of its digits is 648, while the sum is 21.

The square root of 231431133 is about 15212.8607763300. The cubic root of 231431133 is about 613.9607300515.

Adding to 231431133 its reverse (331134132), we get a palindrome (562565265).

The spelling of 231431133 in words is "two hundred thirty-one million, four hundred thirty-one thousand, one hundred thirty-three".