8439913161 has 27 divisors (see below), whose sum is σ = 12345379527. Its totient is φ = 5556237120.

The previous prime is 8439913117. The next prime is 8439913171. The reversal of 8439913161 is 1613199348.

The square root of 8439913161 is 91869.

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

It can be written as a sum of positive squares in only one way, i.e., 148718025 + 8291195136 = 12195^2 + 91056^2 .

It is not a de Polignac number, because 8439913161 - 2¹⁷ = 8439782089 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (8439913171) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 31143456 + ... + 31143726.

Almost surely, 2^8439913161 is an apocalyptic number.

8439913161 is the 91869-th square number.

8439913161 is the 45935-th centered octagonal number.

It is an amenable number.

8439913161 is a deficient number, since it is larger than the sum of its proper divisors (3905466366).

8439913161 is an equidigital number, since it uses as much as digits as its factorization.

8439913161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 387 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The cubic root of 8439913161 is about 2036.0072777012.

It can be divided in two parts, 8439 and 913161, that added together give a square (921600 = 960²).

The spelling of 8439913161 in words is "eight billion, four hundred thirty-nine million, nine hundred thirteen thousand, one hundred sixty-one".