31731760145 has 16 divisors (see below), whose sum is σ = 38342416080. Its totient is φ = 25209667584.

The previous prime is 31731760127. The next prime is 31731760147. The reversal of 31731760145 is 54106713713.

It can be written as a sum of positive squares in 8 ways, for example, as 3949871104 + 27781889041 = 62848^2 + 166679^2 .

It is a cyclic number.

It is not a de Polignac number, because 31731760145 - 2¹⁰ = 31731759121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31731760099 and 31731760108.

It is not an unprimeable number, because it can be changed into a prime (31731760147) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 528311 + ... + 585299.

It is an arithmetic number, because the mean of its divisors is an integer number (2396401005).

Almost surely, 2^31731760145 is an apocalyptic number.

It is an amenable number.

31731760145 is a deficient number, since it is larger than the sum of its proper divisors (6610655935).

31731760145 is a wasteful number, since it uses less digits than its factorization.

31731760145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57764.

The product of its (nonzero) digits is 52920, while the sum is 38.

The spelling of 31731760145 in words is "thirty-one billion, seven hundred thirty-one million, seven hundred sixty thousand, one hundred forty-five".