51669169 has 2 divisors, whose sum is σ = 51669170. Its totient is φ = 51669168.

The previous prime is 51669119. The next prime is 51669173. The reversal of 51669169 is 96196615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51624225 + 44944 = 7185^2 + 212^2 .

It is a cyclic number.

It is not a de Polignac number, because 51669169 - 2¹⁹ = 51144881 is a prime.

It is a super-2 number, since 2×51669169² = 5339406050301122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51669119) 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 as a sum of consecutive naturals, namely, 25834584 + 25834585.

It is an arithmetic number, because the mean of its divisors is an integer number (25834585).

Almost surely, 2^51669169 is an apocalyptic number.

It is an amenable number.

51669169 is a deficient number, since it is larger than the sum of its proper divisors (1).

51669169 is an equidigital number, since it uses as much as digits as its factorization.

51669169 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 87480, while the sum is 43.

The square root of 51669169 is about 7188.1269465696. The cubic root of 51669169 is about 372.4578731093.

The spelling of 51669169 in words is "fifty-one million, six hundred sixty-nine thousand, one hundred sixty-nine".