9943811731161 has 405 divisors, whose sum is σ = 19794852963405. Its totient is φ = 4795157283840.

The previous prime is 9943811731159. The next prime is 9943811731169. The reversal of 9943811731161 is 1611371183499.

The square root of 9943811731161 is 3153381.

It is a perfect power (a square), and thus also a powerful number.

9943811731161 is a `hidden beast` number, since 9 + 9 + 438 + 1 + 17 + 31 + 161 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 1255701777561 + 8688109953600 = 1120581^2 + 2947560^2 .

It is not a de Polignac number, because 9943811731161 - 2¹ = 9943811731159 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 9943811731098 and 9943811731107.

It is not an unprimeable number, because it can be changed into a prime (9943811731169) by changing a digit.

It is a polite number, since it can be written in 404 ways as a sum of consecutive naturals, for example, 136216599021 + ... + 136216599093.

Almost surely, 2^{9943811731161} is an apocalyptic number.

9943811731161 is the 3153381-st square number.

9943811731161 is the 1576691-st centered octagonal number.

It is an amenable number.

9943811731161 is a deficient number, since it is larger than the sum of its proper divisors (9851041232244).

9943811731161 is an equidigital number, since it uses as much as digits as its factorization.

9943811731161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244 (or 111 counting only the distinct ones).

The product of its digits is 979776, while the sum is 54.

The spelling of 9943811731161 in words is "nine trillion, nine hundred forty-three billion, eight hundred eleven million, seven hundred thirty-one thousand, one hundred sixty-one".