31520401101 has 64 divisors (see below), whose sum is σ = 56888320000. Its totient is φ = 16847528256.

The previous prime is 31520401093. The next prime is 31520401103. The reversal of 31520401101 is 10110402513.

31520401101 is a `hidden beast` number, since 3 + 1 + 520 + 40 + 1 + 101 = 666.

It is not a de Polignac number, because 31520401101 - 2³ = 31520401093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31520401103) 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 63 ways as a sum of consecutive naturals, for example, 228135 + ... + 339243.

It is an arithmetic number, because the mean of its divisors is an integer number (888880000).

Almost surely, 2^31520401101 is an apocalyptic number.

It is an amenable number.

31520401101 is a deficient number, since it is larger than the sum of its proper divisors (25367918899).

31520401101 is a wasteful number, since it uses less digits than its factorization.

31520401101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111223 (or 111217 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 18.

Adding to 31520401101 its reverse (10110402513), we get a palindrome (41630803614).

The spelling of 31520401101 in words is "thirty-one billion, five hundred twenty million, four hundred one thousand, one hundred one".