5491989 has 16 divisors (see below), whose sum is σ = 8216640. Its totient is φ = 3625200.

The previous prime is 5491979. The next prime is 5491999. The reversal of 5491989 is 9891945.

It is an interprime number because it is at equal distance from previous prime (5491979) and next prime (5491999).

It is not a de Polignac number, because 5491989 - 2⁴ = 5491973 is a prime.

It is a super-2 number, since 2×5491989² = 60323886352242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5491939) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1939 + ... + 3839.

It is an arithmetic number, because the mean of its divisors is an integer number (513540).

Almost surely, 2^5491989 is an apocalyptic number.

It is an amenable number.

5491989 is a deficient number, since it is larger than the sum of its proper divisors (2724651).

5491989 is a wasteful number, since it uses less digits than its factorization.

5491989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2017 (or 2011 counting only the distinct ones).

The product of its digits is 116640, while the sum is 45.

The square root of 5491989 is about 2343.4993065926. The cubic root of 5491989 is about 176.4316732427.

The spelling of 5491989 in words is "five million, four hundred ninety-one thousand, nine hundred eighty-nine".