5181665 has 12 divisors (see below), whose sum is σ = 6399036. Its totient is φ = 4027968.

The previous prime is 5181653. The next prime is 5181667. The reversal of 5181665 is 5661815.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 954529 + 4227136 = 977^2 + 2056^2 .

It is not a de Polignac number, because 5181665 - 2²² = 987361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5181667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6467 + ... + 7223.

It is an arithmetic number, because the mean of its divisors is an integer number (533253).

Almost surely, 2^5181665 is an apocalyptic number.

It is an amenable number.

5181665 is a deficient number, since it is larger than the sum of its proper divisors (1217371).

5181665 is an equidigital number, since it uses as much as digits as its factorization.

5181665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836 (or 799 counting only the distinct ones).

The product of its digits is 7200, while the sum is 32.

The square root of 5181665 is about 2276.3270854603. The cubic root of 5181665 is about 173.0439595596.

The spelling of 5181665 in words is "five million, one hundred eighty-one thousand, six hundred sixty-five".