131220102109 has 2 divisors, whose sum is σ = 131220102110. Its totient is φ = 131220102108.

The previous prime is 131220102107. The next prime is 131220102127. The reversal of 131220102109 is 901201022131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92409920100 + 38810182009 = 303990^2 + 197003^2 .

It is a cyclic number.

It is not a de Polignac number, because 131220102109 - 2¹ = 131220102107 is a prime.

Together with 131220102107, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 131220102109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131220102107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65610051054 + 65610051055.

It is an arithmetic number, because the mean of its divisors is an integer number (65610051055).

Almost surely, 2^131220102109 is an apocalyptic number.

It is an amenable number.

131220102109 is a deficient number, since it is larger than the sum of its proper divisors (1).

131220102109 is an equidigital number, since it uses as much as digits as its factorization.

131220102109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 131220102109 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred two thousand, one hundred nine".