231533413 has 4 divisors (see below), whose sum is σ = 231592608. Its totient is φ = 231474220.

The previous prime is 231533381. The next prime is 231533431. The reversal of 231533413 is 314335132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231533413 - 2⁵ = 231533381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231533453) 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, 23281 + ... + 31702.

It is an arithmetic number, because the mean of its divisors is an integer number (57898152).

Almost surely, 2^231533413 is an apocalyptic number.

It is an amenable number.

231533413 is a deficient number, since it is larger than the sum of its proper divisors (59195).

231533413 is an equidigital number, since it uses as much as digits as its factorization.

231533413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59194.

The product of its digits is 3240, while the sum is 25.

The square root of 231533413 is about 15216.2220343947. Note that the first 3 decimals coincide. The cubic root of 231533413 is about 614.0511625041.

Adding to 231533413 its reverse (314335132), we get a palindrome (545868545).

The spelling of 231533413 in words is "two hundred thirty-one million, five hundred thirty-three thousand, four hundred thirteen".