131001192221 has 2 divisors, whose sum is σ = 131001192222. Its totient is φ = 131001192220.

The previous prime is 131001192169. The next prime is 131001192247. The reversal of 131001192221 is 122291100131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123113265625 + 7887926596 = 350875^2 + 88814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131001192221 is a prime.

It is a super-2 number, since 2×131001192221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131001192251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65500596110 + 65500596111.

It is an arithmetic number, because the mean of its divisors is an integer number (65500596111).

Almost surely, 2^131001192221 is an apocalyptic number.

It is an amenable number.

131001192221 is a deficient number, since it is larger than the sum of its proper divisors (1).

131001192221 is an equidigital number, since it uses as much as digits as its factorization.

131001192221 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 23.

Adding to 131001192221 its reverse (122291100131), we get a palindrome (253292292352).

The spelling of 131001192221 in words is "one hundred thirty-one billion, one million, one hundred ninety-two thousand, two hundred twenty-one".