161840145 has 8 divisors (see below), whose sum is σ = 258944256. Its totient is φ = 86314736.

The previous prime is 161840143. The next prime is 161840177. The reversal of 161840145 is 541048161.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161840145 - 2¹ = 161840143 is a prime.

It is a super-3 number, since 3×161840145³ (a number of 26 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (161840141) by changing a digit.

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, 5394657 + ... + 5394686.

It is an arithmetic number, because the mean of its divisors is an integer number (32368032).

Almost surely, 2^161840145 is an apocalyptic number.

161840145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161840145 is a deficient number, since it is larger than the sum of its proper divisors (97104111).

161840145 is a wasteful number, since it uses less digits than its factorization.

161840145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10789351.

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 161840145 is about 12721.6408139831. The cubic root of 161840145 is about 544.9568127830.

The spelling of 161840145 in words is "one hundred sixty-one million, eight hundred forty thousand, one hundred forty-five".