161285717 has 6 divisors (see below), whose sum is σ = 164792598. Its totient is φ = 157851944.

The previous prime is 161285713. The next prime is 161285723. The reversal of 161285717 is 717582161.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 152794321 + 8491396 = 12361^2 + 2914^2 .

It is not a de Polignac number, because 161285717 - 2² = 161285713 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 (161285713) 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 5 ways as a sum of consecutive naturals, for example, 34298 + ... + 38715.

It is an arithmetic number, because the mean of its divisors is an integer number (27465433).

Almost surely, 2^161285717 is an apocalyptic number.

It is an amenable number.

161285717 is a deficient number, since it is larger than the sum of its proper divisors (3506881).

161285717 is an frugal number, since it uses more digits than its factorization.

161285717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73107 (or 73060 counting only the distinct ones).

The product of its digits is 23520, while the sum is 38.

The square root of 161285717 is about 12699.8313768333. The cubic root of 161285717 is about 544.3338009123. Note that the first 3 decimals are identical.

The spelling of 161285717 in words is "one hundred sixty-one million, two hundred eighty-five thousand, seven hundred seventeen".