161309746 has 16 divisors (see below), whose sum is σ = 260933400. Its totient is φ = 74348928.

The previous prime is 161309723. The next prime is 161309747. The reversal of 161309746 is 647903161.

It can be written as a sum of positive squares in 4 ways, for example, as 159896025 + 1413721 = 12645^2 + 1189^2 .

It is not an unprimeable number, because it can be changed into a prime (161309747) 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, 17200 + ... + 24868.

Almost surely, 2^161309746 is an apocalyptic number.

161309746 is a deficient number, since it is larger than the sum of its proper divisors (99623654).

161309746 is a wasteful number, since it uses less digits than its factorization.

161309746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8493.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 161309746 is about 12700.7773777828. Note that the first 3 decimals coincide. The cubic root of 161309746 is about 544.3608319222.

The spelling of 161309746 in words is "one hundred sixty-one million, three hundred nine thousand, seven hundred forty-six".