31523512421240 has 256 divisors, whose sum is σ = 81873781862400. Its totient is φ = 10700208470016.

The previous prime is 31523512421209. The next prime is 31523512421251. The reversal of 31523512421240 is 4212421532513.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 31523512421240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 19375237307 + ... + 19375238933.

It is an arithmetic number, because the mean of its divisors is an integer number (319819460400).

Almost surely, 2^{31523512421240} 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 31523512421240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40936890931200).

31523512421240 is an abundant number, since it is smaller than the sum of its proper divisors (50350269441160).

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

31523512421240 is a wasteful number, since it uses less digits than its factorization.

31523512421240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3134 (or 3130 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 35.

Adding to 31523512421240 its reverse (4212421532513), we get a palindrome (35735933953753).

The spelling of 31523512421240 in words is "thirty-one trillion, five hundred twenty-three billion, five hundred twelve million, four hundred twenty-one thousand, two hundred forty".