16506001 has 2 divisors, whose sum is σ = 16506002. Its totient is φ = 16506000.

The previous prime is 16505999. The next prime is 16506037. The reversal of 16506001 is 10060561.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14432401 + 2073600 = 3799^2 + 1440^2 .

It is a cyclic number.

It is not a de Polignac number, because 16506001 - 2¹ = 16505999 is a prime.

Together with 16505999, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 16506001.

It is not a weakly prime, because it can be changed into another prime (16506101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8253000 + 8253001.

It is an arithmetic number, because the mean of its divisors is an integer number (8253001).

Almost surely, 2^16506001 is an apocalyptic number.

It is an amenable number.

16506001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16506001 is an equidigital number, since it uses as much as digits as its factorization.

16506001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 19.

The square root of 16506001 is about 4062.7578072044. The cubic root of 16506001 is about 254.6130283298.

Adding to 16506001 its reverse (10060561), we get a palindrome (26566562).

The spelling of 16506001 in words is "sixteen million, five hundred six thousand, one".