16690001 has 2 divisors, whose sum is σ = 16690002. Its totient is φ = 16690000.

The previous prime is 16689941. The next prime is 16690031. The reversal of 16690001 is 10009661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12609601 + 4080400 = 3551^2 + 2020^2 .

It is a cyclic number.

It is not a de Polignac number, because 16690001 - 2¹⁰ = 16688977 is a prime.

It is a super-2 number, since 2×16690001² = 557112266760002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16690031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8345000 + 8345001.

It is an arithmetic number, because the mean of its divisors is an integer number (8345001).

Almost surely, 2^16690001 is an apocalyptic number.

It is an amenable number.

16690001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16690001 is an equidigital number, since it uses as much as digits as its factorization.

16690001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 23.

The square root of 16690001 is about 4085.3397655519. The cubic root of 16690001 is about 255.5556306728. Note that the first 3 decimals are identical.

Adding to 16690001 its reverse (10009661), we get a palindrome (26699662).

The spelling of 16690001 in words is "sixteen million, six hundred ninety thousand, one".