5561987 has 4 divisors (see below), whose sum is σ = 5577840. Its totient is φ = 5546136.

The previous prime is 5561981. The next prime is 5561993. The reversal of 5561987 is 7891655.

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

It is an interprime number because it is at equal distance from previous prime (5561981) and next prime (5561993).

It is a cyclic number.

It is not a de Polignac number, because 5561987 - 2⁴ = 5561971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5561981) 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, 7388 + ... + 8105.

It is an arithmetic number, because the mean of its divisors is an integer number (1394460).

Almost surely, 2^5561987 is an apocalyptic number.

5561987 is a deficient number, since it is larger than the sum of its proper divisors (15853).

5561987 is a wasteful number, since it uses less digits than its factorization.

5561987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15852.

The product of its digits is 75600, while the sum is 41.

The square root of 5561987 is about 2358.3865247241. The cubic root of 5561987 is about 177.1780794697.

The spelling of 5561987 in words is "five million, five hundred sixty-one thousand, nine hundred eighty-seven".