16515973 has 2 divisors, whose sum is σ = 16515974. Its totient is φ = 16515972.

The previous prime is 16515953. The next prime is 16516009. The reversal of 16515973 is 37951561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16499844 + 16129 = 4062^2 + 127^2 .

It is an emirp because it is prime and its reverse (37951561) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16515973 - 2¹³ = 16507781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16515943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8257986 + 8257987.

It is an arithmetic number, because the mean of its divisors is an integer number (8257987).

Almost surely, 2^16515973 is an apocalyptic number.

It is an amenable number.

16515973 is a deficient number, since it is larger than the sum of its proper divisors (1).

16515973 is an equidigital number, since it uses as much as digits as its factorization.

16515973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 28350, while the sum is 37.

The square root of 16515973 is about 4063.9848670978. The cubic root of 16515973 is about 254.6642923112.

The spelling of 16515973 in words is "sixteen million, five hundred fifteen thousand, nine hundred seventy-three".