31020012073 has 2 divisors, whose sum is σ = 31020012074. Its totient is φ = 31020012072.

The previous prime is 31020012061. The next prime is 31020012151. The reversal of 31020012073 is 37021002013.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28273413609 + 2746598464 = 168147^2 + 52408^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31020012073 is a prime.

It is a super-2 number, since 2×31020012073² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31020012073.

It is not a weakly prime, because it can be changed into another prime (31020019073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15510006036 + 15510006037.

It is an arithmetic number, because the mean of its divisors is an integer number (15510006037).

Almost surely, 2^31020012073 is an apocalyptic number.

It is an amenable number.

31020012073 is a deficient number, since it is larger than the sum of its proper divisors (1).

31020012073 is an equidigital number, since it uses as much as digits as its factorization.

31020012073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 252, while the sum is 19.

Adding to 31020012073 its reverse (37021002013), we get a palindrome (68041014086).

The spelling of 31020012073 in words is "thirty-one billion, twenty million, twelve thousand, seventy-three".