31520420534104 has 16 divisors (see below), whose sum is σ = 59101040578320. Its totient is φ = 15760143046560.

The previous prime is 31520420534101. The next prime is 31520420534189. The reversal of 31520420534104 is 40143502402513.

It is a self number, because there is not a number n which added to its sum of digits gives 31520420534104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31520420534101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6381084 + ... + 10186219.

It is an arithmetic number, because the mean of its divisors is an integer number (3693815036145).

Almost surely, 2^{31520420534104} is an apocalyptic number.

It is an amenable number.

31520420534104 is a deficient number, since it is larger than the sum of its proper divisors (27580620044216).

31520420534104 is a wasteful number, since it uses less digits than its factorization.

31520420534104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16805130 (or 16805126 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 31520420534104 its reverse (40143502402513), we get a palindrome (71663922936617).

The spelling of 31520420534104 in words is "thirty-one trillion, five hundred twenty billion, four hundred twenty million, five hundred thirty-four thousand, one hundred four".