51181169 has 8 divisors (see below), whose sum is σ = 58360680. Its totient is φ = 44464896.

The previous prime is 51181153. The next prime is 51181171. The reversal of 51181169 is 96118115.

It can be written as a sum of positive squares in 4 ways, for example, as 4080400 + 47100769 = 2020^2 + 6863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51181169 - 2⁴ = 51181153 is a prime.

It is a super-2 number, since 2×51181169² = 5239024120413122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (51181139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115574 + ... + 116015.

It is an arithmetic number, because the mean of its divisors is an integer number (7295085).

Almost surely, 2^51181169 is an apocalyptic number.

It is an amenable number.

51181169 is a deficient number, since it is larger than the sum of its proper divisors (7179511).

51181169 is a wasteful number, since it uses less digits than its factorization.

51181169 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231619.

The product of its digits is 2160, while the sum is 32.

The square root of 51181169 is about 7154.1015508588. The cubic root of 51181169 is about 371.2815772738.

The spelling of 51181169 in words is "fifty-one million, one hundred eighty-one thousand, one hundred sixty-nine".