8161961547 has 8 divisors (see below), whose sum is σ = 10895777856. Its totient is φ = 5434726472.

The previous prime is 8161961543. The next prime is 8161961557. The reversal of 8161961547 is 7451691618.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8161961547 - 2² = 8161961543 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 8161961496 and 8161961505.

It is not an unprimeable number, because it can be changed into a prime (8161961543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1642413 + ... + 1647374.

It is an arithmetic number, because the mean of its divisors is an integer number (1361972232).

Almost surely, 2^8161961547 is an apocalyptic number.

8161961547 is a deficient number, since it is larger than the sum of its proper divisors (2733816309).

8161961547 is a wasteful number, since it uses less digits than its factorization.

8161961547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3290617.

The product of its digits is 362880, while the sum is 48.

The square root of 8161961547 is about 90343.5750178174. The cubic root of 8161961547 is about 2013.4067246399.

The spelling of 8161961547 in words is "eight billion, one hundred sixty-one million, nine hundred sixty-one thousand, five hundred forty-seven".