161443743 has 8 divisors (see below), whose sum is σ = 216547968. Its totient is φ = 106984344.

The previous prime is 161443729. The next prime is 161443769. The reversal of 161443743 is 347344161.

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

It is not a de Polignac number, because 161443743 - 2⁴ = 161443727 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161443943) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160621 + ... + 161622.

It is an arithmetic number, because the mean of its divisors is an integer number (27068496).

Almost surely, 2^161443743 is an apocalyptic number.

161443743 is a deficient number, since it is larger than the sum of its proper divisors (55104225).

161443743 is a wasteful number, since it uses less digits than its factorization.

161443743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322413.

The product of its digits is 24192, while the sum is 33.

The square root of 161443743 is about 12706.0514322900. The cubic root of 161443743 is about 544.5115203381.

The spelling of 161443743 in words is "one hundred sixty-one million, four hundred forty-three thousand, seven hundred forty-three".