31431100340 has 96 divisors (see below), whose sum is σ = 70261502976. Its totient is φ = 11785213440.

The previous prime is 31431100339. The next prime is 31431100361. The reversal of 31431100340 is 4300113413.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8219669 + ... + 8223491.

It is an arithmetic number, because the mean of its divisors is an integer number (731890656).

Almost surely, 2^31431100340 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 31431100340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35130751488).

31431100340 is an abundant number, since it is smaller than the sum of its proper divisors (38830402636).

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

31431100340 is a wasteful number, since it uses less digits than its factorization.

31431100340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4209 (or 4207 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31431100340 its reverse (4300113413), we get a palindrome (35731213753).

The spelling of 31431100340 in words is "thirty-one billion, four hundred thirty-one million, one hundred thousand, three hundred forty".