161947017 has 6 divisors (see below), whose sum is σ = 233923482. Its totient is φ = 107964672.

The previous prime is 161946943. The next prime is 161947031. The reversal of 161947017 is 710749161.

161947017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 81378441 + 80568576 = 9021^2 + 8976^2 .

It is not a de Polignac number, because 161947017 - 2²² = 157752713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161947087) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8997048 + ... + 8997065.

It is an arithmetic number, because the mean of its divisors is an integer number (38987247).

Almost surely, 2^161947017 is an apocalyptic number.

It is an amenable number.

161947017 is a deficient number, since it is larger than the sum of its proper divisors (71976465).

161947017 is a wasteful number, since it uses less digits than its factorization.

161947017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17994119 (or 17994116 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 36.

The square root of 161947017 is about 12725.8405223388. The cubic root of 161947017 is about 545.0767414310.

The spelling of 161947017 in words is "one hundred sixty-one million, nine hundred forty-seven thousand, seventeen".