231532501551020 has 48 divisors (see below), whose sum is σ = 487585849296000. Its totient is φ = 92352835687680.

The previous prime is 231532501550969. The next prime is 231532501551023. The reversal of 231532501551020 is 20155105235132.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (231532501551023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 944306 + ... + 21539654.

It is an arithmetic number, because the mean of its divisors is an integer number (10158038527000).

Almost surely, 2^{231532501551020} is an apocalyptic number.

231532501551020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

231532501551020 is an abundant number, since it is smaller than the sum of its proper divisors (256053347744980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

231532501551020 is a wasteful number, since it uses less digits than its factorization.

231532501551020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20596938 (or 20596936 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 35.

Adding to 231532501551020 its reverse (20155105235132), we get a palindrome (251687606786152).

The spelling of 231532501551020 in words is "two hundred thirty-one trillion, five hundred thirty-two billion, five hundred one million, five hundred fifty-one thousand, twenty".