161573536 has 12 divisors (see below), whose sum is σ = 318097962. Its totient is φ = 80786752.

The previous prime is 161573507. The next prime is 161573539. The reversal of 161573536 is 635375161.

It can be written as a sum of positive squares in only one way, i.e., 157653136 + 3920400 = 12556^2 + 1980^2 .

It is a super-2 number, since 2×161573536² = 52212015071086592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161573495 and 161573504.

It is not an unprimeable number, because it can be changed into a prime (161573539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2524555 + ... + 2524618.

Almost surely, 2^161573536 is an apocalyptic number.

161573536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161573536 is a deficient number, since it is larger than the sum of its proper divisors (156524426).

161573536 is an equidigital number, since it uses as much as digits as its factorization.

161573536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5049183 (or 5049175 counting only the distinct ones).

The product of its digits is 56700, while the sum is 37.

The square root of 161573536 is about 12711.1579330917. The cubic root of 161573536 is about 544.6574016040.

The spelling of 161573536 in words is "one hundred sixty-one million, five hundred seventy-three thousand, five hundred thirty-six".