161220847 has 8 divisors (see below), whose sum is σ = 162182880. Its totient is φ = 160262400.

The previous prime is 161220821. The next prime is 161220883. The reversal of 161220847 is 748022161.

161220847 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161220847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161220817) 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, 163518 + ... + 164500.

It is an arithmetic number, because the mean of its divisors is an integer number (20272860).

Almost surely, 2^161220847 is an apocalyptic number.

161220847 is a deficient number, since it is larger than the sum of its proper divisors (962033).

161220847 is an equidigital number, since it uses as much as digits as its factorization.

161220847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1793.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 161220847 is about 12697.2771490584. The cubic root of 161220847 is about 544.2608131127.

The spelling of 161220847 in words is "one hundred sixty-one million, two hundred twenty thousand, eight hundred forty-seven".