161712730 has 16 divisors (see below), whose sum is σ = 291253320. Its totient is φ = 64647232.

The previous prime is 161712713. The next prime is 161712779. The reversal of 161712730 is 37217161.

It can be written as a sum of positive squares in 4 ways, for example, as 161061481 + 651249 = 12691^2 + 807^2 .

It is an unprimeable number.

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, 18756 + ... + 25984.

Almost surely, 2^161712730 is an apocalyptic number.

161712730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161712730 is a deficient number, since it is larger than the sum of its proper divisors (129540590).

161712730 is a wasteful number, since it uses less digits than its factorization.

161712730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473.

The product of its (nonzero) digits is 1764, while the sum is 28.

The square root of 161712730 is about 12716.6320226702. The cubic root of 161712730 is about 544.8137623627.

Adding to 161712730 its reverse (37217161), we get a palindrome (198929891).

The spelling of 161712730 in words is "one hundred sixty-one million, seven hundred twelve thousand, seven hundred thirty".