10001521 has 2 divisors, whose sum is σ = 10001522. Its totient is φ = 10001520.

The previous prime is 10001501. The next prime is 10001531. The reversal of 10001521 is 12510001.

It is a happy number.

It is an a-pointer prime, because the next prime (10001531) can be obtained adding 10001521 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6630625 + 3370896 = 2575^2 + 1836^2 .

It is a cyclic number.

It is not a de Polignac number, because 10001521 - 2⁹ = 10001009 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 10001498 and 10001507.

It is not a weakly prime, because it can be changed into another prime (10001501) 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, 5000760 + 5000761.

It is an arithmetic number, because the mean of its divisors is an integer number (5000761).

Almost surely, 2^10001521 is an apocalyptic number.

It is an amenable number.

10001521 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001521 is an equidigital number, since it uses as much as digits as its factorization.

10001521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10, while the sum is 10.

The square root of 10001521 is about 3162.5181422405. The cubic root of 10001521 is about 215.4543914333.

Adding to 10001521 its reverse (12510001), we get a palindrome (22511522).

The spelling of 10001521 in words is "ten million, one thousand, five hundred twenty-one".