5191987 has 4 divisors (see below), whose sum is σ = 5497416. Its totient is φ = 4886560.

The previous prime is 5191981. The next prime is 5191999. The reversal of 5191987 is 7891915.

It is a happy number.

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 5191987 - 2¹¹ = 5189939 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5191981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152689 + ... + 152722.

It is an arithmetic number, because the mean of its divisors is an integer number (1374354).

Almost surely, 2^5191987 is an apocalyptic number.

5191987 is a deficient number, since it is larger than the sum of its proper divisors (305429).

5191987 is a wasteful number, since it uses less digits than its factorization.

5191987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305428.

The product of its digits is 22680, while the sum is 40.

The square root of 5191987 is about 2278.5932063447. The cubic root of 5191987 is about 173.1587859096.

The spelling of 5191987 in words is "five million, one hundred ninety-one thousand, nine hundred eighty-seven".