15516001 has 2 divisors, whose sum is σ = 15516002. Its totient is φ = 15516000.

The previous prime is 15515959. The next prime is 15516013. The reversal of 15516001 is 10061551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14622976 + 893025 = 3824^2 + 945^2 .

It is an emirp because it is prime and its reverse (10061551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 15516001 - 2⁷ = 15515873 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 15516001.

It is not a weakly prime, because it can be changed into another prime (15516071) 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, 7758000 + 7758001.

It is an arithmetic number, because the mean of its divisors is an integer number (7758001).

Almost surely, 2^15516001 is an apocalyptic number.

It is an amenable number.

15516001 is a deficient number, since it is larger than the sum of its proper divisors (1).

15516001 is an equidigital number, since it uses as much as digits as its factorization.

15516001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150, while the sum is 19.

The square root of 15516001 is about 3939.0355418554. The cubic root of 15516001 is about 249.4173149677.

Adding to 15516001 its reverse (10061551), we get a palindrome (25577552).

The spelling of 15516001 in words is "fifteen million, five hundred sixteen thousand, one".