161730647 has 4 divisors (see below), whose sum is σ = 174171480. Its totient is φ = 149289816.

The previous prime is 161730643. The next prime is 161730727. The reversal of 161730647 is 746037161.

161730647 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 161730647 - 2² = 161730643 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 (161730643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6220397 + ... + 6220422.

It is an arithmetic number, because the mean of its divisors is an integer number (43542870).

Almost surely, 2^161730647 is an apocalyptic number.

161730647 is a deficient number, since it is larger than the sum of its proper divisors (12440833).

161730647 is a wasteful number, since it uses less digits than its factorization.

161730647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12440832.

The product of its (nonzero) digits is 21168, while the sum is 35.

The square root of 161730647 is about 12717.3364742779. The cubic root of 161730647 is about 544.8338825427.

The spelling of 161730647 in words is "one hundred sixty-one million, seven hundred thirty thousand, six hundred forty-seven".