231220400450 has 54 divisors (see below), whose sum is σ = 465786084267. Its totient is φ = 85357365600.

The previous prime is 231220400449. The next prime is 231220400461. The reversal of 231220400450 is 54004022132.

It is a happy number.

231220400450 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 5 ways, for example, as 14475217969 + 216745182481 = 120313^2 + 465559^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=340015.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 44199335 + ... + 44204565.

Almost surely, 2^231220400450 is an apocalyptic number.

231220400450 is an abundant number, since it is smaller than the sum of its proper divisors (234565683817).

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

231220400450 is an frugal number, since it uses more digits than its factorization.

231220400450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10500 (or 5251 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 231220400450 its reverse (54004022132), we get a palindrome (285224422582).

The spelling of 231220400450 in words is "two hundred thirty-one billion, two hundred twenty million, four hundred thousand, four hundred fifty".