202131322117 has 2 divisors, whose sum is σ = 202131322118. Its totient is φ = 202131322116.

The previous prime is 202131322109. The next prime is 202131322147. The reversal of 202131322117 is 711223131202.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 194374292641 + 7757029476 = 440879^2 + 88074^2 .

It is a cyclic number.

It is not a de Polignac number, because 202131322117 - 2³ = 202131322109 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 202131322091 and 202131322100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (202131322147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101065661058 + 101065661059.

It is an arithmetic number, because the mean of its divisors is an integer number (101065661059).

Almost surely, 2^202131322117 is an apocalyptic number.

It is an amenable number.

202131322117 is a deficient number, since it is larger than the sum of its proper divisors (1).

202131322117 is an equidigital number, since it uses as much as digits as its factorization.

202131322117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 25.

Adding to 202131322117 its reverse (711223131202), we get a palindrome (913354453319).

The spelling of 202131322117 in words is "two hundred two billion, one hundred thirty-one million, three hundred twenty-two thousand, one hundred seventeen".