16520173 has 2 divisors, whose sum is σ = 16520174. Its totient is φ = 16520172.

The previous prime is 16520159. The next prime is 16520183. The reversal of 16520173 is 37102561.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14455204 + 2064969 = 3802^2 + 1437^2 .

It is an emirp because it is prime and its reverse (37102561) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16520173 is a prime.

It is a super-2 number, since 2×16520173² = 545832231899858, which contains 22 as substring.

It is equal to p_1062394 and since 16520173 and 1062394 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16520143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8260086 + 8260087.

It is an arithmetic number, because the mean of its divisors is an integer number (8260087).

Almost surely, 2^16520173 is an apocalyptic number.

It is an amenable number.

16520173 is a deficient number, since it is larger than the sum of its proper divisors (1).

16520173 is an equidigital number, since it uses as much as digits as its factorization.

16520173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 16520173 is about 4064.5015684583. The cubic root of 16520173 is about 254.6858774634.

The spelling of 16520173 in words is "sixteen million, five hundred twenty thousand, one hundred seventy-three".