5161681 has 16 divisors (see below), whose sum is σ = 6243840. Its totient is φ = 4173120.

The previous prime is 5161679. The next prime is 5161697. The reversal of 5161681 is 1861615.

It is not a de Polignac number, because 5161681 - 2¹ = 5161679 is a prime.

It is a super-2 number, since 2×5161681² = 53285901491522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5161631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9271 + ... + 9811.

It is an arithmetic number, because the mean of its divisors is an integer number (390240).

Almost surely, 2^5161681 is an apocalyptic number.

It is an amenable number.

5161681 is a deficient number, since it is larger than the sum of its proper divisors (1082159).

5161681 is a wasteful number, since it uses less digits than its factorization.

5161681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 624.

The product of its digits is 1440, while the sum is 28.

The square root of 5161681 is about 2271.9333176834. The cubic root of 5161681 is about 172.8212148343.

It can be divided in two parts, 516 and 1681, that added together give a cube (2197 = 13³).

The spelling of 5161681 in words is "five million, one hundred sixty-one thousand, six hundred eighty-one".