51869173 has 2 divisors, whose sum is σ = 51869174. Its totient is φ = 51869172.

The previous prime is 51869171. The next prime is 51869177. The reversal of 51869173 is 37196815.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49238289 + 2630884 = 7017^2 + 1622^2 .

It is a cyclic number.

It is not a de Polignac number, because 51869173 - 2¹ = 51869171 is a prime.

It is a super-2 number, since 2×51869173² = 5380822215407858, which contains 22 as substring.

Together with 51869171, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51869171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25934586 + 25934587.

It is an arithmetic number, because the mean of its divisors is an integer number (25934587).

Almost surely, 2^51869173 is an apocalyptic number.

It is an amenable number.

51869173 is a deficient number, since it is larger than the sum of its proper divisors (1).

51869173 is an equidigital number, since it uses as much as digits as its factorization.

51869173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 40.

The square root of 51869173 is about 7202.0256178384. The cubic root of 51869173 is about 372.9378314978.

The spelling of 51869173 in words is "fifty-one million, eight hundred sixty-nine thousand, one hundred seventy-three".