131281697 has 4 divisors (see below), whose sum is σ = 138191280. Its totient is φ = 124372116.

The previous prime is 131281691. The next prime is 131281727. The reversal of 131281697 is 796182131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 131281697 - 2¹⁶ = 131216161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 131281697.

It is not an unprimeable number, because it can be changed into a prime (131281691) 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, 3454763 + ... + 3454800.

It is an arithmetic number, because the mean of its divisors is an integer number (34547820).

Almost surely, 2^131281697 is an apocalyptic number.

It is an amenable number.

131281697 is a deficient number, since it is larger than the sum of its proper divisors (6909583).

131281697 is an equidigital number, since it uses as much as digits as its factorization.

131281697 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6909582.

The product of its digits is 18144, while the sum is 38.

The square root of 131281697 is about 11457.8225243717. The cubic root of 131281697 is about 508.2390852293.

The spelling of 131281697 in words is "one hundred thirty-one million, two hundred eighty-one thousand, six hundred ninety-seven".