31503016161 has 6 divisors (see below), whose sum is σ = 45504356690. Its totient is φ = 21002010768.

The previous prime is 31503016123. The next prime is 31503016201. The reversal of 31503016161 is 16161030513.

31503016161 is a `hidden beast` number, since 3 + 15 + 0 + 30 + 1 + 616 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30062358225 + 1440657936 = 173385^2 + 37956^2 .

It is not a de Polignac number, because 31503016161 - 2²² = 31498821857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31503016561) 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 5 ways as a sum of consecutive naturals, for example, 1750167556 + ... + 1750167573.

Almost surely, 2^31503016161 is an apocalyptic number.

It is an amenable number.

31503016161 is a deficient number, since it is larger than the sum of its proper divisors (14001340529).

31503016161 is a wasteful number, since it uses less digits than its factorization.

31503016161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3500335135 (or 3500335132 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

Adding to 31503016161 its reverse (16161030513), we get a palindrome (47664046674).

The spelling of 31503016161 in words is "thirty-one billion, five hundred three million, sixteen thousand, one hundred sixty-one".