231620532 has 144 divisors (see below), whose sum is σ = 658945728. Its totient is φ = 62415360.

The previous prime is 231620513. The next prime is 231620549. The reversal of 231620532 is 235026132.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3172848 + ... + 3172920.

It is an arithmetic number, because the mean of its divisors is an integer number (4576012).

Almost surely, 2^231620532 is an apocalyptic number.

231620532 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231620532, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (329472864).

231620532 is an abundant number, since it is smaller than the sum of its proper divisors (427325196).

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

231620532 is a wasteful number, since it uses less digits than its factorization.

231620532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190 (or 145 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 231620532 is about 15219.0844665505. The cubic root of 231620532 is about 614.1281691218.

Adding to 231620532 its reverse (235026132), we get a palindrome (466646664).

The spelling of 231620532 in words is "two hundred thirty-one million, six hundred twenty thousand, five hundred thirty-two".