161728747 has 2 divisors, whose sum is σ = 161728748. Its totient is φ = 161728746.

The previous prime is 161728733. The next prime is 161728771. The reversal of 161728747 is 747827161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161728747 - 2¹¹ = 161726699 is a prime.

It is not a weakly prime, because it can be changed into another prime (161728717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80864373 + 80864374.

It is an arithmetic number, because the mean of its divisors is an integer number (80864374).

Almost surely, 2^161728747 is an apocalyptic number.

161728747 is a deficient number, since it is larger than the sum of its proper divisors (1).

161728747 is an equidigital number, since it uses as much as digits as its factorization.

161728747 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 131712, while the sum is 43.

The square root of 161728747 is about 12717.2617728818. The cubic root of 161728747 is about 544.8317489779.

The spelling of 161728747 in words is "one hundred sixty-one million, seven hundred twenty-eight thousand, seven hundred forty-seven".