31405451873 has 2 divisors, whose sum is σ = 31405451874. Its totient is φ = 31405451872.

The previous prime is 31405451863. The next prime is 31405451981. The reversal of 31405451873 is 37815450413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29108454544 + 2296997329 = 170612^2 + 47927^2 .

It is a cyclic number.

It is not a de Polignac number, because 31405451873 - 2⁶ = 31405451809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31405451873.

It is not a weakly prime, because it can be changed into another prime (31405451843) 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, 15702725936 + 15702725937.

It is an arithmetic number, because the mean of its divisors is an integer number (15702725937).

Almost surely, 2^31405451873 is an apocalyptic number.

It is an amenable number.

31405451873 is a deficient number, since it is larger than the sum of its proper divisors (1).

31405451873 is an equidigital number, since it uses as much as digits as its factorization.

31405451873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 201600, while the sum is 41.

The spelling of 31405451873 in words is "thirty-one billion, four hundred five million, four hundred fifty-one thousand, eight hundred seventy-three".