161254643 has 16 divisors (see below), whose sum is σ = 179340000. Its totient is φ = 144967680.

The previous prime is 161254631. The next prime is 161254649. The reversal of 161254643 is 346452161.

It is not a de Polignac number, because 161254643 - 2⁶ = 161254579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161254649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128483 + ... + 129731.

It is an arithmetic number, because the mean of its divisors is an integer number (11208750).

Almost surely, 2^161254643 is an apocalyptic number.

161254643 is a deficient number, since it is larger than the sum of its proper divisors (18085357).

161254643 is an equidigital number, since it uses as much as digits as its factorization.

161254643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1379 (or 1357 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 161254643 is about 12698.6079158308. The cubic root of 161254643 is about 544.2988407699.

The spelling of 161254643 in words is "one hundred sixty-one million, two hundred fifty-four thousand, six hundred forty-three".