161744143 has 16 divisors (see below), whose sum is σ = 182817792. Its totient is φ = 141768000.

The previous prime is 161744117. The next prime is 161744147. The reversal of 161744143 is 341447161.

It is a de Polignac number, because none of the positive numbers 2^k-161744143 is a prime.

It is a super-2 number, since 2×161744143² = 52322335589608898, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161744147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112155 + ... + 113587.

It is an arithmetic number, because the mean of its divisors is an integer number (11426112).

Almost surely, 2^161744143 is an apocalyptic number.

161744143 is a deficient number, since it is larger than the sum of its proper divisors (21073649).

161744143 is a wasteful number, since it uses less digits than its factorization.

161744143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1806.

The product of its digits is 8064, while the sum is 31.

The square root of 161744143 is about 12717.8670774623. The cubic root of 161744143 is about 544.8490371093.

The spelling of 161744143 in words is "one hundred sixty-one million, seven hundred forty-four thousand, one hundred forty-three".