51020173 has 2 divisors, whose sum is σ = 51020174. Its totient is φ = 51020172.

The previous prime is 51020161. The next prime is 51020197. The reversal of 51020173 is 37102015.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47032164 + 3988009 = 6858^2 + 1997^2 .

It is a cyclic number.

It is not a de Polignac number, because 51020173 - 2¹³ = 51011981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51020173.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51020143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25510086 + 25510087.

It is an arithmetic number, because the mean of its divisors is an integer number (25510087).

Almost surely, 2^51020173 is an apocalyptic number.

It is an amenable number.

51020173 is a deficient number, since it is larger than the sum of its proper divisors (1).

51020173 is an equidigital number, since it uses as much as digits as its factorization.

51020173 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 210, while the sum is 19.

The square root of 51020173 is about 7142.8406814096. The cubic root of 51020173 is about 370.8918660065.

Adding to 51020173 its reverse (37102015), we get a palindrome (88122188).

The spelling of 51020173 in words is "fifty-one million, twenty thousand, one hundred seventy-three".