131211220229 has 2 divisors, whose sum is σ = 131211220230. Its totient is φ = 131211220228.

The previous prime is 131211220213. The next prime is 131211220237. The reversal of 131211220229 is 922022112131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 106191256900 + 25019963329 = 325870^2 + 158177^2 .

It is a cyclic number.

It is not a de Polignac number, because 131211220229 - 2⁴ = 131211220213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 131211220198 and 131211220207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131511220229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65605610114 + 65605610115.

It is an arithmetic number, because the mean of its divisors is an integer number (65605610115).

Almost surely, 2^131211220229 is an apocalyptic number.

It is an amenable number.

131211220229 is a deficient number, since it is larger than the sum of its proper divisors (1).

131211220229 is an equidigital number, since it uses as much as digits as its factorization.

131211220229 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The spelling of 131211220229 in words is "one hundred thirty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred twenty-nine".