161227506 has 16 divisors (see below), whose sum is σ = 351769248. Its totient is φ = 48856800.

The previous prime is 161227499. The next prime is 161227513. The reversal of 161227506 is 605722161.

It is an interprime number because it is at equal distance from previous prime (161227499) and next prime (161227513).

It is a Curzon number.

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, 1221355 + ... + 1221486.

It is an arithmetic number, because the mean of its divisors is an integer number (21985578).

Almost surely, 2^161227506 is an apocalyptic number.

161227506 is an abundant number, since it is smaller than the sum of its proper divisors (190541742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161227506 is a wasteful number, since it uses less digits than its factorization.

161227506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2442857.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 161227506 is about 12697.5393679248. The cubic root of 161227506 is about 544.2683063183.

Adding to 161227506 its reverse (605722161), we get a palindrome (766949667).

The spelling of 161227506 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, five hundred six".