9920531 has 2 divisors, whose sum is σ = 9920532. Its totient is φ = 9920530.

The previous prime is 9920513. The next prime is 9920539. The reversal of 9920531 is 1350299.

Together with previous prime (9920513) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9920531 - 2⁶ = 9920467 is a prime.

It is a super-2 number, since 2×9920531² = 196833870643922, which contains 22 as substring.

It is a Chen prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 9920494 and 9920503.

It is not a weakly prime, because it can be changed into another prime (9920539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4960265 + 4960266.

It is an arithmetic number, because the mean of its divisors is an integer number (4960266).

Almost surely, 2^9920531 is an apocalyptic number.

9920531 is a deficient number, since it is larger than the sum of its proper divisors (1).

9920531 is an equidigital number, since it uses as much as digits as its factorization.

9920531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2430, while the sum is 29.

The square root of 9920531 is about 3149.6874448110. The cubic root of 9920531 is about 214.8712479532.

The spelling of 9920531 in words is "nine million, nine hundred twenty thousand, five hundred thirty-one".