31420173773 has 2 divisors, whose sum is σ = 31420173774. Its totient is φ = 31420173772.

The previous prime is 31420173737. The next prime is 31420173779. The reversal of 31420173773 is 37737102413.

Together with previous prime (31420173737) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22554633124 + 8865540649 = 150182^2 + 94157^2 .

It is an emirp because it is prime and its reverse (37737102413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31420173773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31420173779) 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 as a sum of consecutive naturals, namely, 15710086886 + 15710086887.

It is an arithmetic number, because the mean of its divisors is an integer number (15710086887).

Almost surely, 2^31420173773 is an apocalyptic number.

It is an amenable number.

31420173773 is a deficient number, since it is larger than the sum of its proper divisors (1).

31420173773 is an equidigital number, since it uses as much as digits as its factorization.

31420173773 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 74088, while the sum is 38.

The spelling of 31420173773 in words is "thirty-one billion, four hundred twenty million, one hundred seventy-three thousand, seven hundred seventy-three".