161905596 has 24 divisors (see below), whose sum is σ = 382026960. Its totient is φ = 53361792.

The previous prime is 161905589. The next prime is 161905643. The reversal of 161905596 is 695509161.

It is a super-2 number, since 2×161905596² = 52426844032230432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 74731 + ... + 76866.

It is an arithmetic number, because the mean of its divisors is an integer number (15917790).

Almost surely, 2^161905596 is an apocalyptic number.

It is an amenable number.

161905596 is an abundant number, since it is smaller than the sum of its proper divisors (220121364).

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

161905596 is a wasteful number, since it uses less digits than its factorization.

161905596 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151693 (or 151691 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 42.

The square root of 161905596 is about 12724.2129815561. The cubic root of 161905596 is about 545.0302662539.

The spelling of 161905596 in words is "one hundred sixty-one million, nine hundred five thousand, five hundred ninety-six".