131162774221 has 2 divisors, whose sum is σ = 131162774222. Its totient is φ = 131162774220.

The previous prime is 131162774201. The next prime is 131162774251. The reversal of 131162774221 is 122477261131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118532161225 + 12630612996 = 344285^2 + 112386^2 .

It is a cyclic number.

It is not a de Polignac number, because 131162774221 - 2²¹ = 131160677069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131162774201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65581387110 + 65581387111.

It is an arithmetic number, because the mean of its divisors is an integer number (65581387111).

Almost surely, 2^131162774221 is an apocalyptic number.

It is an amenable number.

131162774221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131162774221 is an equidigital number, since it uses as much as digits as its factorization.

131162774221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 37.

The spelling of 131162774221 in words is "one hundred thirty-one billion, one hundred sixty-two million, seven hundred seventy-four thousand, two hundred twenty-one".