5491987 has 4 divisors (see below), whose sum is σ = 5498440. Its totient is φ = 5485536.

The previous prime is 5491979. The next prime is 5491999. The reversal of 5491987 is 7891945.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7891945 = 5 ⋅1578389.

It is a cyclic number.

It is not a de Polignac number, because 5491987 - 2³ = 5491979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5491907) 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, 1713 + ... + 3730.

It is an arithmetic number, because the mean of its divisors is an integer number (1374610).

Almost surely, 2^5491987 is an apocalyptic number.

5491987 is a deficient number, since it is larger than the sum of its proper divisors (6453).

5491987 is a wasteful number, since it uses less digits than its factorization.

5491987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6452.

The product of its digits is 90720, while the sum is 43.

The square root of 5491987 is about 2343.4988798803. The cubic root of 5491987 is about 176.4316518258.

The spelling of 5491987 in words is "five million, four hundred ninety-one thousand, nine hundred eighty-seven".