131223208997 has 2 divisors, whose sum is σ = 131223208998. Its totient is φ = 131223208996.

The previous prime is 131223208969. The next prime is 131223209009. The reversal of 131223208997 is 799802322131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77659198276 + 53564010721 = 278674^2 + 231439^2 .

It is a cyclic number.

It is not a de Polignac number, because 131223208997 - 2²⁶ = 131156100133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131253208997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611604498 + 65611604499.

It is an arithmetic number, because the mean of its divisors is an integer number (65611604499).

Almost surely, 2^131223208997 is an apocalyptic number.

It is an amenable number.

131223208997 is a deficient number, since it is larger than the sum of its proper divisors (1).

131223208997 is an equidigital number, since it uses as much as digits as its factorization.

131223208997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 131223208997 in words is "one hundred thirty-one billion, two hundred twenty-three million, two hundred eight thousand, nine hundred ninety-seven".