231551532550 has 48 divisors (see below), whose sum is σ = 465129917280. Its totient is φ = 85253667840.

The previous prime is 231551532547. The next prime is 231551532571. The reversal of 231551532550 is 55235155132.

It is a super-2 number, since 2×231551532550² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 275130 + ... + 734029.

It is an arithmetic number, because the mean of its divisors is an integer number (9690206610).

Almost surely, 2^231551532550 is an apocalyptic number.

231551532550 is an abundant number, since it is smaller than the sum of its proper divisors (233578384730).

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

231551532550 is a wasteful number, since it uses less digits than its factorization.

231551532550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1009537 (or 1009532 counting only the distinct ones).

The product of its (nonzero) digits is 112500, while the sum is 37.

Adding to 231551532550 its reverse (55235155132), we get a palindrome (286786687682).

The spelling of 231551532550 in words is "two hundred thirty-one billion, five hundred fifty-one million, five hundred thirty-two thousand, five hundred fifty".