161353506 has 32 divisors (see below), whose sum is σ = 338434560. Its totient is φ = 51214464.

The previous prime is 161353499. The next prime is 161353589. The reversal of 161353506 is 605353161.

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 15 ways as a sum of consecutive naturals, for example, 6351 + ... + 19053.

It is an arithmetic number, because the mean of its divisors is an integer number (10576080).

Almost surely, 2^161353506 is an apocalyptic number.

It is a pronic number, being equal to 12702×12703.

161353506 is an abundant number, since it is smaller than the sum of its proper divisors (177081054).

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

161353506 is a wasteful number, since it uses less digits than its factorization.

161353506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12810.

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 161353506 is about 12702.4999901594. The cubic root of 161353506 is about 544.4100520857.

It can be divided in two parts, 161353 and 506, that multiplied together give a palindrome (81644618).

The spelling of 161353506 in words is "one hundred sixty-one million, three hundred fifty-three thousand, five hundred six".