31132231440 has 160 divisors (see below), whose sum is σ = 101039533056. Its totient is φ = 7914677760.

The previous prime is 31132231439. The next prime is 31132231453. The reversal of 31132231440 is 4413223113.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 31132231440.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1685455 + ... + 1703825.

Almost surely, 2^31132231440 is an apocalyptic number.

31132231440 is a gapful number since it is divisible by the number (30) 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 31132231440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50519766528).

31132231440 is an abundant number, since it is smaller than the sum of its proper divisors (69907301616).

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

31132231440 is a wasteful number, since it uses less digits than its factorization.

31132231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18717 (or 18711 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

Adding to 31132231440 its reverse (4413223113), we get a palindrome (35545454553).

The spelling of 31132231440 in words is "thirty-one billion, one hundred thirty-two million, two hundred thirty-one thousand, four hundred forty".