15001001 has 2 divisors, whose sum is σ = 15001002. Its totient is φ = 15001000.

The previous prime is 15000977. The next prime is 15001027. The reversal of 15001001 is 10010051.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14440000 + 561001 = 3800^2 + 749^2 .

It is a cyclic number.

It is not a de Polignac number, because 15001001 - 2¹⁰ = 14999977 is a prime.

It is a Chen prime.

15001001 is a modest number, since divided by 1001 gives 15 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 15001001.

It is not a weakly prime, because it can be changed into another prime (15001031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7500500 + 7500501.

It is an arithmetic number, because the mean of its divisors is an integer number (7500501).

Almost surely, 2^15001001 is an apocalyptic number.

It is an amenable number.

15001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

15001001 is an equidigital number, since it uses as much as digits as its factorization.

15001001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5, while the sum is 8.

The square root of 15001001 is about 3873.1125725958. The cubic root of 15001001 is about 246.6266932628.

Adding to 15001001 its reverse (10010051), we get a palindrome (25011052).

The spelling of 15001001 in words is "fifteen million, one thousand, one".