10001531 has 2 divisors, whose sum is σ = 10001532. Its totient is φ = 10001530.

The previous prime is 10001521. The next prime is 10001533. The reversal of 10001531 is 13510001.

10001531 is nontrivially palindromic in base 3.

It is a strong prime.

It is an emirp because it is prime and its reverse (13510001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 10001531 - 2²² = 5807227 is a prime.

It is a super-2 number, since 2×10001531² = 200061244687922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 10001533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (10001533) 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, 5000765 + 5000766.

It is an arithmetic number, because the mean of its divisors is an integer number (5000766).

Almost surely, 2^10001531 is an apocalyptic number.

10001531 is a deficient number, since it is larger than the sum of its proper divisors (1).

10001531 is an equidigital number, since it uses as much as digits as its factorization.

10001531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15, while the sum is 11.

The square root of 10001531 is about 3162.5197232587. The cubic root of 10001531 is about 215.4544632405.

Adding to 10001531 its reverse (13510001), we get a palindrome (23511532).

The spelling of 10001531 in words is "ten million, one thousand, five hundred thirty-one".