231545505503521 has 8 divisors (see below), whose sum is σ = 253323036677664. Its totient is φ = 209889297623520.

The previous prime is 231545505503513. The next prime is 231545505503573. The reversal of 231545505503521 is 125305505545132.

231545505503521 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 231545505503521 - 2³ = 231545505503513 is a prime.

It is a super-2 number, since 2×231545505503521² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231545505501521) 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, 30330819540 + ... + 30330827173.

It is an arithmetic number, because the mean of its divisors is an integer number (31665379584708).

Almost surely, 2^{231545505503521} is an apocalyptic number.

It is an amenable number.

231545505503521 is a deficient number, since it is larger than the sum of its proper divisors (21777531174143).

231545505503521 is a wasteful number, since it uses less digits than its factorization.

231545505503521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60661647071.

The product of its (nonzero) digits is 2250000, while the sum is 46.

The spelling of 231545505503521 in words is "two hundred thirty-one trillion, five hundred forty-five billion, five hundred five million, five hundred three thousand, five hundred twenty-one".