51369169 has 2 divisors, whose sum is σ = 51369170. Its totient is φ = 51369168.

The previous prime is 51369127. The next prime is 51369181. The reversal of 51369169 is 96196315.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50594769 + 774400 = 7113^2 + 880^2 .

It is a cyclic number.

It is not a de Polignac number, because 51369169 - 2¹⁵ = 51336401 is a prime.

It is a super-2 number, since 2×51369169² = 5277583047501122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51369119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25684584 + 25684585.

It is an arithmetic number, because the mean of its divisors is an integer number (25684585).

Almost surely, 2^51369169 is an apocalyptic number.

It is an amenable number.

51369169 is a deficient number, since it is larger than the sum of its proper divisors (1).

51369169 is an equidigital number, since it uses as much as digits as its factorization.

51369169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 40.

The square root of 51369169 is about 7167.2288229134. The cubic root of 51369169 is about 371.7356221696.

The spelling of 51369169 in words is "fifty-one million, three hundred sixty-nine thousand, one hundred sixty-nine".