131122987 has 4 divisors (see below), whose sum is σ = 131301160. Its totient is φ = 130944816.

The previous prime is 131122969. The next prime is 131123029. The reversal of 131122987 is 789221131.

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

It is a cyclic number.

It is not a de Polignac number, because 131122987 - 2¹¹ = 131120939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (131122907) 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, 87978 + ... + 89455.

It is an arithmetic number, because the mean of its divisors is an integer number (32825290).

Almost surely, 2^131122987 is an apocalyptic number.

131122987 is a deficient number, since it is larger than the sum of its proper divisors (178173).

131122987 is an equidigital number, since it uses as much as digits as its factorization.

131122987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178172.

The product of its digits is 6048, while the sum is 34.

The square root of 131122987 is about 11450.8945938734. The cubic root of 131122987 is about 508.0341946416.

The spelling of 131122987 in words is "one hundred thirty-one million, one hundred twenty-two thousand, nine hundred eighty-seven".