31445872873 has 2 divisors, whose sum is σ = 31445872874. Its totient is φ = 31445872872.

The previous prime is 31445872831. The next prime is 31445872933. The reversal of 31445872873 is 37827854413.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31140602089 + 305270784 = 176467^2 + 17472^2 .

It is an emirp because it is prime and its reverse (37827854413) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31445872873 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31445872873.

It is not a weakly prime, because it can be changed into another prime (31445870873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15722936436 + 15722936437.

It is an arithmetic number, because the mean of its divisors is an integer number (15722936437).

Almost surely, 2^31445872873 is an apocalyptic number.

It is an amenable number.

31445872873 is a deficient number, since it is larger than the sum of its proper divisors (1).

31445872873 is an equidigital number, since it uses as much as digits as its factorization.

31445872873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4515840, while the sum is 52.

The spelling of 31445872873 in words is "thirty-one billion, four hundred forty-five million, eight hundred seventy-two thousand, eight hundred seventy-three".