161305447 has 8 divisors (see below), whose sum is σ = 164540160. Its totient is φ = 158077920.

The previous prime is 161305423. The next prime is 161305481. The reversal of 161305447 is 744503161.

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 161305447 - 2¹⁵ = 161272679 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 (161305847) 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, 76929 + ... + 78997.

It is an arithmetic number, because the mean of its divisors is an integer number (20567520).

Almost surely, 2^161305447 is an apocalyptic number.

161305447 is a deficient number, since it is larger than the sum of its proper divisors (3234713).

161305447 is a wasteful number, since it uses less digits than its factorization.

161305447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 161305447 is about 12700.6081350461. The cubic root of 161305447 is about 544.3559960333.

The spelling of 161305447 in words is "one hundred sixty-one million, three hundred five thousand, four hundred forty-seven".