31520420512353 has 64 divisors (see below), whose sum is σ = 49999957032960. Its totient is φ = 19590735427200.

The previous prime is 31520420512349. The next prime is 31520420512363. The reversal of 31520420512353 is 35321502402513.

31520420512353 is a `hidden beast` number, since 3 + 1 + 52 + 0 + 42 + 0 + 512 + 3 + 53 = 666.

It is not a de Polignac number, because 31520420512353 - 2² = 31520420512349 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31520420512303) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3371193 + ... + 8625878.

It is an arithmetic number, because the mean of its divisors is an integer number (781249328640).

Almost surely, 2^{31520420512353} is an apocalyptic number.

It is an amenable number.

31520420512353 is a deficient number, since it is larger than the sum of its proper divisors (18479536520607).

31520420512353 is a wasteful number, since it uses less digits than its factorization.

31520420512353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11997227 (or 11997221 counting only the distinct ones).

The product of its (nonzero) digits is 108000, while the sum is 36.

Adding to 31520420512353 its reverse (35321502402513), we get a palindrome (66841922914866).

The spelling of 31520420512353 in words is "thirty-one trillion, five hundred twenty billion, four hundred twenty million, five hundred twelve thousand, three hundred fifty-three".