161255994 has 16 divisors (see below), whose sum is σ = 325706400. Its totient is φ = 53219600.

The previous prime is 161255989. The next prime is 161256023. The reversal of 161255994 is 499552161.

It is a super-3 number, since 3×161255994³ (a number of 26 digits) contains 333 as substring.

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, 132444 + ... + 133655.

It is an arithmetic number, because the mean of its divisors is an integer number (20356650).

Almost surely, 2^161255994 is an apocalyptic number.

161255994 is an abundant number, since it is smaller than the sum of its proper divisors (164450406).

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

161255994 is a wasteful number, since it uses less digits than its factorization.

161255994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266205.

The product of its digits is 97200, while the sum is 42.

The square root of 161255994 is about 12698.6611105266. The cubic root of 161255994 is about 544.3003608206.

The spelling of 161255994 in words is "one hundred sixty-one million, two hundred fifty-five thousand, nine hundred ninety-four".