31371172873 has 2 divisors, whose sum is σ = 31371172874. Its totient is φ = 31371172872.

The previous prime is 31371172867. The next prime is 31371172879. The reversal of 31371172873 is 37827117313.

It is a balanced prime because it is at equal distance from previous prime (31371172867) and next prime (31371172879).

It can be written as a sum of positive squares in only one way, i.e., 31248339984 + 122832889 = 176772^2 + 11083^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31371172873 is a prime.

It is not a weakly prime, because it can be changed into another prime (31371172879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15685586436 + 15685586437.

It is an arithmetic number, because the mean of its divisors is an integer number (15685586437).

Almost surely, 2^31371172873 is an apocalyptic number.

It is an amenable number.

31371172873 is a deficient number, since it is larger than the sum of its proper divisors (1).

31371172873 is an equidigital number, since it uses as much as digits as its factorization.

31371172873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 148176, while the sum is 43.

The spelling of 31371172873 in words is "thirty-one billion, three hundred seventy-one million, one hundred seventy-two thousand, eight hundred seventy-three".