31123202101 has 2 divisors, whose sum is σ = 31123202102. Its totient is φ = 31123202100.

The previous prime is 31123202069. The next prime is 31123202113. The reversal of 31123202101 is 10120232113.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19539846225 + 11583355876 = 139785^2 + 107626^2 .

It is an emirp because it is prime and its reverse (10120232113) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31123202101 - 2⁵ = 31123202069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31123202141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15561601050 + 15561601051.

It is an arithmetic number, because the mean of its divisors is an integer number (15561601051).

Almost surely, 2^31123202101 is an apocalyptic number.

It is an amenable number.

31123202101 is a deficient number, since it is larger than the sum of its proper divisors (1).

31123202101 is an equidigital number, since it uses as much as digits as its factorization.

31123202101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 31123202101 its reverse (10120232113), we get a palindrome (41243434214).

The spelling of 31123202101 in words is "thirty-one billion, one hundred twenty-three million, two hundred two thousand, one hundred one".