9961654531 has 2 divisors, whose sum is σ = 9961654532. Its totient is φ = 9961654530.

The previous prime is 9961654519. The next prime is 9961654597. The reversal of 9961654531 is 1354561699.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 9961654531 - 2¹⁵ = 9961621763 is a prime.

It is a super-2 number, since 2×9961654531² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9961654501) 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, 4980827265 + 4980827266.

It is an arithmetic number, because the mean of its divisors is an integer number (4980827266).

Almost surely, 2^9961654531 is an apocalyptic number.

9961654531 is a deficient number, since it is larger than the sum of its proper divisors (1).

9961654531 is an equidigital number, since it uses as much as digits as its factorization.

9961654531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 874800, while the sum is 49.

The square root of 9961654531 is about 99808.0885048902. The cubic root of 9961654531 is about 2151.6774024194.

The spelling of 9961654531 in words is "nine billion, nine hundred sixty-one million, six hundred fifty-four thousand, five hundred thirty-one".