8521631 has 2 divisors, whose sum is σ = 8521632. Its totient is φ = 8521630.

The previous prime is 8521619. The next prime is 8521649. The reversal of 8521631 is 1361258.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8521631 - 2⁶ = 8521567 is a prime.

It is a super-2 number, since 2×8521631² = 145236389800322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 8521631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8521231) 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, 4260815 + 4260816.

It is an arithmetic number, because the mean of its divisors is an integer number (4260816).

Almost surely, 2^8521631 is an apocalyptic number.

8521631 is a deficient number, since it is larger than the sum of its proper divisors (1).

8521631 is an equidigital number, since it uses as much as digits as its factorization.

8521631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 26.

The square root of 8521631 is about 2919.1832761922. The cubic root of 8521631 is about 204.2557266504.

Adding to 8521631 its reverse (1361258), we get a palindrome (9882889).

The spelling of 8521631 in words is "eight million, five hundred twenty-one thousand, six hundred thirty-one".