231520001540233 has 32 divisors (see below), whose sum is σ = 277661415680000. Its totient is φ = 192856672906128.

The previous prime is 231520001540173. The next prime is 231520001540251. The reversal of 231520001540233 is 332045100025132.

It is a de Polignac number, because none of the positive numbers 2^k-231520001540233 is a prime.

It is a super-2 number, since 2×231520001540233² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231520001540195 and 231520001540204.

It is not an unprimeable number, because it can be changed into a prime (231520001540033) 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, 36505491 + ... + 42375592.

It is an arithmetic number, because the mean of its divisors is an integer number (8676919240000).

Almost surely, 2^{231520001540233} is an apocalyptic number.

It is an amenable number.

231520001540233 is a deficient number, since it is larger than the sum of its proper divisors (46141414139767).

231520001540233 is an equidigital number, since it uses as much as digits as its factorization.

231520001540233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78881346 (or 78881332 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

Adding to 231520001540233 its reverse (332045100025132), we get a palindrome (563565101565365).

The spelling of 231520001540233 in words is "two hundred thirty-one trillion, five hundred twenty billion, one million, five hundred forty thousand, two hundred thirty-three".