231545129 has 8 divisors (see below), whose sum is σ = 237784320. Its totient is φ = 225388800.

The previous prime is 231545113. The next prime is 231545143. The reversal of 231545129 is 921545132.

231545129 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 231545129 - 2⁴ = 231545113 is a prime.

It is a super-2 number, since 2×231545129² = 107226293527253282, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 231545095 and 231545104.

It is not an unprimeable number, because it can be changed into a prime (231545189) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15032 + ... + 26249.

It is an arithmetic number, because the mean of its divisors is an integer number (29723040).

Almost surely, 2^231545129 is an apocalyptic number.

It is an amenable number.

231545129 is a deficient number, since it is larger than the sum of its proper divisors (6239191).

231545129 is an equidigital number, since it uses as much as digits as its factorization.

231545129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41431.

The product of its digits is 10800, while the sum is 32.

The square root of 231545129 is about 15216.6070133917. The cubic root of 231545129 is about 614.0615196876.

The spelling of 231545129 in words is "two hundred thirty-one million, five hundred forty-five thousand, one hundred twenty-nine".