13001531 has 2 divisors, whose sum is σ = 13001532. Its totient is φ = 13001530.

The previous prime is 13001507. The next prime is 13001533. The reversal of 13001531 is 13510031.

It is a strong prime.

It is an emirp because it is prime and its reverse (13510031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13001531 - 2¹⁸ = 12739387 is a prime.

It is a super-2 number, since 2×13001531² = 338079616687922, which contains 22 as substring.

Together with 13001533, 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 (13001533) 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, 6500765 + 6500766.

It is an arithmetic number, because the mean of its divisors is an integer number (6500766).

Almost surely, 2^13001531 is an apocalyptic number.

13001531 is a deficient number, since it is larger than the sum of its proper divisors (1).

13001531 is an equidigital number, since it uses as much as digits as its factorization.

13001531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 13001531 is about 3605.7635807135. The cubic root of 13001531 is about 235.1426989057.

Adding to 13001531 its reverse (13510031), we get a palindrome (26511562).

The spelling of 13001531 in words is "thirteen million, one thousand, five hundred thirty-one".