161247643 has 8 divisors (see below), whose sum is σ = 162201920. Its totient is φ = 160296840.

The previous prime is 161247617. The next prime is 161247673. The reversal of 161247643 is 346742161.

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 161247643 - 2⁹ = 161247131 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 161247599 and 161247608.

It is not an unprimeable number, because it can be changed into a prime (161247673) 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, 204496 + ... + 205282.

It is an arithmetic number, because the mean of its divisors is an integer number (20275240).

Almost surely, 2^161247643 is an apocalyptic number.

161247643 is a deficient number, since it is larger than the sum of its proper divisors (954277).

161247643 is an equidigital number, since it uses as much as digits as its factorization.

161247643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737.

The product of its digits is 24192, while the sum is 34.

The square root of 161247643 is about 12698.3322920768. The cubic root of 161247643 is about 544.2909647238.

The spelling of 161247643 in words is "one hundred sixty-one million, two hundred forty-seven thousand, six hundred forty-three".