31506220673 has 2 divisors, whose sum is σ = 31506220674. Its totient is φ = 31506220672.

The previous prime is 31506220667. The next prime is 31506220699. The reversal of 31506220673 is 37602260513.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20802869824 + 10703350849 = 144232^2 + 103457^2 .

It is a cyclic number.

It is not a de Polignac number, because 31506220673 - 2⁴ = 31506220657 is a prime.

It is not a weakly prime, because it can be changed into another prime (31506220373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15753110336 + 15753110337.

It is an arithmetic number, because the mean of its divisors is an integer number (15753110337).

Almost surely, 2^31506220673 is an apocalyptic number.

It is an amenable number.

31506220673 is a deficient number, since it is larger than the sum of its proper divisors (1).

31506220673 is an equidigital number, since it uses as much as digits as its factorization.

31506220673 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 45360, while the sum is 35.

The spelling of 31506220673 in words is "thirty-one billion, five hundred six million, two hundred twenty thousand, six hundred seventy-three".