131329997 has 4 divisors (see below), whose sum is σ = 132630396. Its totient is φ = 130029600.

The previous prime is 131329963. The next prime is 131329999. The reversal of 131329997 is 799923131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 126810121 + 4519876 = 11261^2 + 2126^2 .

It is a cyclic number.

It is not a de Polignac number, because 131329997 - 2⁸ = 131329741 is a prime.

It is a super-2 number, since 2×131329997² = 34495136224040018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131329999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 650048 + ... + 650249.

It is an arithmetic number, because the mean of its divisors is an integer number (33157599).

Almost surely, 2^131329997 is an apocalyptic number.

It is an amenable number.

131329997 is a deficient number, since it is larger than the sum of its proper divisors (1300399).

131329997 is a wasteful number, since it uses less digits than its factorization.

131329997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300398.

The product of its digits is 91854, while the sum is 44.

The square root of 131329997 is about 11459.9300608686. The cubic root of 131329997 is about 508.3014065290.

The spelling of 131329997 in words is "one hundred thirty-one million, three hundred twenty-nine thousand, nine hundred ninety-seven".