131688877 has 4 divisors (see below), whose sum is σ = 134490816. Its totient is φ = 128886940.

The previous prime is 131688871. The next prime is 131688881. The reversal of 131688877 is 778886131.

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 a de Polignac number, because none of the positive numbers 2^k-131688877 is a prime.

It is a super-2 number, since 2×131688877² = 34683920651042258, which contains 22 as substring.

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 131688877.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131688871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1400899 + ... + 1400992.

It is an arithmetic number, because the mean of its divisors is an integer number (33622704).

Almost surely, 2^131688877 is an apocalyptic number.

It is an amenable number.

131688877 is a deficient number, since it is larger than the sum of its proper divisors (2801939).

131688877 is an equidigital number, since it uses as much as digits as its factorization.

131688877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2801938.

The product of its digits is 451584, while the sum is 49.

The square root of 131688877 is about 11475.5774146663. The cubic root of 131688877 is about 508.7639901012.

The spelling of 131688877 in words is "one hundred thirty-one million, six hundred eighty-eight thousand, eight hundred seventy-seven".