131220102091 has 4 divisors (see below), whose sum is σ = 141313956112. Its totient is φ = 121126248072.

The previous prime is 131220102053. The next prime is 131220102107. The reversal of 131220102091 is 190201022131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190201022131 = 3881 ⋅49008251.

It is a cyclic number.

It is not a de Polignac number, because 131220102091 - 2¹⁹ = 131219577803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131220102011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5046926991 + ... + 5046927016.

It is an arithmetic number, because the mean of its divisors is an integer number (35328489028).

Almost surely, 2^131220102091 is an apocalyptic number.

131220102091 is a deficient number, since it is larger than the sum of its proper divisors (10093854021).

131220102091 is a wasteful number, since it uses less digits than its factorization.

131220102091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10093854020.

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

The spelling of 131220102091 in words is "one hundred thirty-one billion, two hundred twenty million, one hundred two thousand, ninety-one".