161443243 has 8 divisors (see below), whose sum is σ = 174146336. Its totient is φ = 148780800.

The previous prime is 161443229. The next prime is 161443277. The reversal of 161443243 is 342344161.

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 161443243 - 2¹³ = 161435051 is a prime.

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, 1638 + ... + 18043.

It is an arithmetic number, because the mean of its divisors is an integer number (21768292).

Almost surely, 2^161443243 is an apocalyptic number.

161443243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

161443243 is a deficient number, since it is larger than the sum of its proper divisors (12703093).

161443243 is a wasteful number, since it uses less digits than its factorization.

161443243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20325.

The product of its digits is 6912, while the sum is 28.

The square root of 161443243 is about 12706.0317566107. The cubic root of 161443243 is about 544.5109582104.

The spelling of 161443243 in words is "one hundred sixty-one million, four hundred forty-three thousand, two hundred forty-three".