51690173 has 2 divisors, whose sum is σ = 51690174. Its totient is φ = 51690172.

The previous prime is 51690097. The next prime is 51690179. The reversal of 51690173 is 37109615.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49942489 + 1747684 = 7067^2 + 1322^2 .

It is a cyclic number.

It is not a de Polignac number, because 51690173 - 2¹⁰ = 51689149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51690179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25845086 + 25845087.

It is an arithmetic number, because the mean of its divisors is an integer number (25845087).

Almost surely, 2^51690173 is an apocalyptic number.

It is an amenable number.

51690173 is a deficient number, since it is larger than the sum of its proper divisors (1).

51690173 is an equidigital number, since it uses as much as digits as its factorization.

51690173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 51690173 is about 7189.5878185053. The cubic root of 51690173 is about 372.5083354740.

Adding to 51690173 its reverse (37109615), we get a palindrome (88799788).

It can be divided in two parts, 516901 and 73, that multiplied together give a palindrome (37733773).

The spelling of 51690173 in words is "fifty-one million, six hundred ninety thousand, one hundred seventy-three".