131328997 has 2 divisors, whose sum is σ = 131328998. Its totient is φ = 131328996.

The previous prime is 131328949. The next prime is 131329001. The reversal of 131328997 is 799823131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80263681 + 51065316 = 8959^2 + 7146^2 .

It is an emirp because it is prime and its reverse (799823131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131328997 - 2¹⁵ = 131296229 is a prime.

It is equal to p_7449298 and since 131328997 and 7449298 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131328917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65664498 + 65664499.

It is an arithmetic number, because the mean of its divisors is an integer number (65664499).

Almost surely, 2^131328997 is an apocalyptic number.

It is an amenable number.

131328997 is a deficient number, since it is larger than the sum of its proper divisors (1).

131328997 is an equidigital number, since it uses as much as digits as its factorization.

131328997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 81648, while the sum is 43.

The square root of 131328997 is about 11459.8864305018. The cubic root of 131328997 is about 508.3001163878.

The spelling of 131328997 in words is "one hundred thirty-one million, three hundred twenty-eight thousand, nine hundred ninety-seven".