161333081 has 32 divisors (see below), whose sum is σ = 204288000. Its totient is φ = 124027200.

The previous prime is 161333027. The next prime is 161333101. The reversal of 161333081 is 180333161.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 161333081 - 2¹⁴ = 161316697 is a prime.

It is a super-2 number, since 2×161333081² = 52056726049905122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161333081.

It is not an unprimeable number, because it can be changed into a prime (161333581) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 810620 + ... + 810818.

It is an arithmetic number, because the mean of its divisors is an integer number (6384000).

Almost surely, 2^161333081 is an apocalyptic number.

It is an amenable number.

161333081 is a deficient number, since it is larger than the sum of its proper divisors (42954919).

161333081 is a wasteful number, since it uses less digits than its factorization.

161333081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 161333081 is about 12701.6959891189. The cubic root of 161333081 is about 544.3870796595.

The spelling of 161333081 in words is "one hundred sixty-one million, three hundred thirty-three thousand, eighty-one".