161731706 has 8 divisors (see below), whose sum is σ = 244508160. Its totient is φ = 80228988.

The previous prime is 161731663. The next prime is 161731741. The reversal of 161731706 is 607137161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 318116 + ... + 318623.

It is an arithmetic number, because the mean of its divisors is an integer number (30563520).

Almost surely, 2^161731706 is an apocalyptic number.

161731706 is a deficient number, since it is larger than the sum of its proper divisors (82776454).

161731706 is a wasteful number, since it uses less digits than its factorization.

161731706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636868.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 161731706 is about 12717.3781102867. The cubic root of 161731706 is about 544.8350717171.

Adding to 161731706 its reverse (607137161), we get a palindrome (768868867).

The spelling of 161731706 in words is "one hundred sixty-one million, seven hundred thirty-one thousand, seven hundred six".