31311243432 has 192 divisors, whose sum is σ = 99069360000. Its totient is φ = 8930186496.

The previous prime is 31311243391. The next prime is 31311243449. The reversal of 31311243432 is 23434211313.

It is a happy number.

31311243432 is a `hidden beast` number, since 3 + 1 + 311 + 2 + 4 + 343 + 2 = 666.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 31311243396 and 31311243405.

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, 27733044 + ... + 27734172.

It is an arithmetic number, because the mean of its divisors is an integer number (515986250).

Almost surely, 2^31311243432 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 31311243432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49534680000).

31311243432 is an abundant number, since it is smaller than the sum of its proper divisors (67758116568).

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

31311243432 is a wasteful number, since it uses less digits than its factorization.

31311243432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2285 (or 2264 counting only the distinct ones).

The product of its digits is 5184, while the sum is 27.

Adding to 31311243432 its reverse (23434211313), we get a palindrome (54745454745).

The spelling of 31311243432 in words is "thirty-one billion, three hundred eleven million, two hundred forty-three thousand, four hundred thirty-two".