1431221632 has 64 divisors (see below), whose sum is σ = 2929093200. Its totient is φ = 696213504.

The previous prime is 1431221599. The next prime is 1431221633. The reversal of 1431221632 is 2361221341.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 1431221597 and 1431221606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1431221633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2515044 + ... + 2515612.

Almost surely, 2^1431221632 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 1431221632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1464546600).

1431221632 is an abundant number, since it is smaller than the sum of its proper divisors (1497871568).

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

1431221632 is an equidigital number, since it uses as much as digits as its factorization.

1431221632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083 (or 1071 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 1431221632 is about 37831.4899521549. The cubic root of 1431221632 is about 1126.9439002809.

Adding to 1431221632 its reverse (2361221341), we get a palindrome (3792442973).

The spelling of 1431221632 in words is "one billion, four hundred thirty-one million, two hundred twenty-one thousand, six hundred thirty-two".