131123987 has 4 divisors (see below), whose sum is σ = 132920280. Its totient is φ = 129327696.

The previous prime is 131123969. The next prime is 131124011. The reversal of 131123987 is 789321131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789321131 = 107 ⋅7376833.

It is a cyclic number.

It is not a de Polignac number, because 131123987 - 2²² = 126929683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131123917) 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, 898037 + ... + 898182.

It is an arithmetic number, because the mean of its divisors is an integer number (33230070).

Almost surely, 2^131123987 is an apocalyptic number.

131123987 is a deficient number, since it is larger than the sum of its proper divisors (1796293).

131123987 is an equidigital number, since it uses as much as digits as its factorization.

131123987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1796292.

The product of its digits is 9072, while the sum is 35.

The square root of 131123987 is about 11450.9382585009. The cubic root of 131123987 is about 508.0354861337.

The spelling of 131123987 in words is "one hundred thirty-one million, one hundred twenty-three thousand, nine hundred eighty-seven".