16623001 has 2 divisors, whose sum is σ = 16623002. Its totient is φ = 16623000.

The previous prime is 16622993. The next prime is 16623011. The reversal of 16623001 is 10032661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16321600 + 301401 = 4040^2 + 549^2 .

It is a cyclic number.

It is not a de Polignac number, because 16623001 - 2³ = 16622993 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16623001.

It is not a weakly prime, because it can be changed into another prime (16623011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8311500 + 8311501.

It is an arithmetic number, because the mean of its divisors is an integer number (8311501).

Almost surely, 2^16623001 is an apocalyptic number.

It is an amenable number.

16623001 is a deficient number, since it is larger than the sum of its proper divisors (1).

16623001 is an equidigital number, since it uses as much as digits as its factorization.

16623001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 16623001 is about 4077.1314670979. The cubic root of 16623001 is about 255.2132062836.

Adding to 16623001 its reverse (10032661), we get a palindrome (26655662).

The spelling of 16623001 in words is "sixteen million, six hundred twenty-three thousand, one".