161305697 has 8 divisors (see below), whose sum is σ = 188112000. Its totient is φ = 138261732.

The previous prime is 161305657. The next prime is 161305699. The reversal of 161305697 is 796503161.

It is not a de Polignac number, because 161305697 - 2¹⁶ = 161240161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161305697.

It is not an unprimeable number, because it can be changed into a prime (161305699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 234797 + ... + 235482.

It is an arithmetic number, because the mean of its divisors is an integer number (23514000).

Almost surely, 2^161305697 is an apocalyptic number.

It is an amenable number.

161305697 is a deficient number, since it is larger than the sum of its proper divisors (26806303).

161305697 is an frugal number, since it uses more digits than its factorization.

161305697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 470300 (or 470286 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 161305697 is about 12700.6179770907. The cubic root of 161305697 is about 544.3562772574.

The spelling of 161305697 in words is "one hundred sixty-one million, three hundred five thousand, six hundred ninety-seven".