31243313040 has 80 divisors (see below), whose sum is σ = 96923112000. Its totient is φ = 8325628416.

The previous prime is 31243313011. The next prime is 31243313041. The reversal of 31243313040 is 4031334213.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×31243313040² (a number of 22 digits) contains 22 as substring.

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 31243313040.

It is not an unprimeable number, because it can be changed into a prime (31243313041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 297411 + ... + 388509.

It is an arithmetic number, because the mean of its divisors is an integer number (1211538900).

Almost surely, 2^31243313040 is an apocalyptic number.

31243313040 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31243313040 is an abundant number, since it is smaller than the sum of its proper divisors (65679798960).

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

31243313040 is a wasteful number, since it uses less digits than its factorization.

31243313040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92544 (or 92538 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 24.

Adding to 31243313040 its reverse (4031334213), we get a palindrome (35274647253).

The spelling of 31243313040 in words is "thirty-one billion, two hundred forty-three million, three hundred thirteen thousand, forty".