131223208969 has 2 divisors, whose sum is σ = 131223208970. Its totient is φ = 131223208968.

The previous prime is 131223208951. The next prime is 131223208997. The reversal of 131223208969 is 969802322131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 115576201225 + 15647007744 = 339965^2 + 125088^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223208969 - 2⁷ = 131223208841 is a prime.

It is a super-2 number, since 2×131223208969² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (131223208169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611604484 + 65611604485.

It is an arithmetic number, because the mean of its divisors is an integer number (65611604485).

Almost surely, 2^131223208969 is an apocalyptic number.

It is an amenable number.

131223208969 is a deficient number, since it is larger than the sum of its proper divisors (1).

131223208969 is an equidigital number, since it uses as much as digits as its factorization.

131223208969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 279936, while the sum is 46.

The spelling of 131223208969 in words is "one hundred thirty-one billion, two hundred twenty-three million, two hundred eight thousand, nine hundred sixty-nine".