8520431 has 2 divisors, whose sum is σ = 8520432. Its totient is φ = 8520430.

The previous prime is 8520427. The next prime is 8520433. The reversal of 8520431 is 1340258.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 8520431 - 2² = 8520427 is a prime.

It is a super-2 number, since 2×8520431² = 145195488851522, which contains 22 as substring.

Together with 8520433, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 8520397 and 8520406.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8520433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4260215 + 4260216.

It is an arithmetic number, because the mean of its divisors is an integer number (4260216).

Almost surely, 2^8520431 is an apocalyptic number.

8520431 is a deficient number, since it is larger than the sum of its proper divisors (1).

8520431 is an equidigital number, since it uses as much as digits as its factorization.

8520431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 8520431 is about 2918.9777320151. The cubic root of 8520431 is about 204.2461385650.

Adding to 8520431 its reverse (1340258), we get a palindrome (9860689).

The spelling of 8520431 in words is "eight million, five hundred twenty thousand, four hundred thirty-one".