9913531 has 2 divisors, whose sum is σ = 9913532. Its totient is φ = 9913530.

The previous prime is 9913523. The next prime is 9913549. The reversal of 9913531 is 1353199.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9913531 - 2³ = 9913523 is a prime.

It is a super-2 number, since 2×9913531² = 196556193775922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 9913493 and 9913502.

It is not a weakly prime, because it can be changed into another prime (9913511) 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, 4956765 + 4956766.

It is an arithmetic number, because the mean of its divisors is an integer number (4956766).

Almost surely, 2^9913531 is an apocalyptic number.

9913531 is a deficient number, since it is larger than the sum of its proper divisors (1).

9913531 is an equidigital number, since it uses as much as digits as its factorization.

9913531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3645, while the sum is 31.

The square root of 9913531 is about 3148.5760273495. The cubic root of 9913531 is about 214.8206978149.

The spelling of 9913531 in words is "nine million, nine hundred thirteen thousand, five hundred thirty-one".