8531531 has 2 divisors, whose sum is σ = 8531532. Its totient is φ = 8531530.

The previous prime is 8531507. The next prime is 8531533. The reversal of 8531531 is 1351358.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8531531 is a prime.

It is a super-2 number, since 2×8531531² = 145574042407922, which contains 22 as substring.

Together with 8531533, it forms a pair of twin primes.

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 8531531.

It is not a weakly prime, because it can be changed into another prime (8531533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4265765 + 4265766.

It is an arithmetic number, because the mean of its divisors is an integer number (4265766).

Almost surely, 2^8531531 is an apocalyptic number.

8531531 is a deficient number, since it is larger than the sum of its proper divisors (1).

8531531 is an equidigital number, since it uses as much as digits as its factorization.

8531531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 26.

The square root of 8531531 is about 2920.8784637502. The cubic root of 8531531 is about 204.3347940312.

Adding to 8531531 its reverse (1351358), we get a palindrome (9882889).

The spelling of 8531531 in words is "eight million, five hundred thirty-one thousand, five hundred thirty-one".