231220632 has 64 divisors (see below), whose sum is σ = 594000000. Its totient is φ = 74962944.

The previous prime is 231220559. The next prime is 231220637. The reversal of 231220632 is 236022132.

It is a junction number, because it is equal to n+sod(n) for n = 231220599 and 231220608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231220637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 463119 + ... + 463617.

It is an arithmetic number, because the mean of its divisors is an integer number (9281250).

Almost surely, 2^231220632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 231220632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (297000000).

231220632 is an abundant number, since it is smaller than the sum of its proper divisors (362779368).

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

231220632 is a wasteful number, since it uses less digits than its factorization.

231220632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1000 (or 996 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 231220632 is about 15205.9406811943. The cubic root of 231220632 is about 613.7745284379.

Adding to 231220632 its reverse (236022132), we get a palindrome (467242764).

The spelling of 231220632 in words is "two hundred thirty-one million, two hundred twenty thousand, six hundred thirty-two".