231545443430505 has 32 divisors (see below), whose sum is σ = 376761325518720. Its totient is φ = 121394802460160.

The previous prime is 231545443430501. The next prime is 231545443430531. The reversal of 231545443430505 is 505034344545132.

It is not a de Polignac number, because 231545443430505 - 2² = 231545443430501 is a prime.

It is a super-2 number, since 2×231545443430505² (a number of 30 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231545443430501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32374045 + ... + 38873765.

It is an arithmetic number, because the mean of its divisors is an integer number (11773791422460).

Almost surely, 2^{231545443430505} is an apocalyptic number.

It is an amenable number.

231545443430505 is a deficient number, since it is larger than the sum of its proper divisors (145215882088215).

231545443430505 is a wasteful number, since it uses less digits than its factorization.

231545443430505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6540041.

The product of its (nonzero) digits is 8640000, while the sum is 48.

Adding to 231545443430505 its reverse (505034344545132), we get a palindrome (736579787975637).

The spelling of 231545443430505 in words is "two hundred thirty-one trillion, five hundred forty-five billion, four hundred forty-three million, four hundred thirty thousand, five hundred five".