161846689 has 2 divisors, whose sum is σ = 161846690. Its totient is φ = 161846688.

The previous prime is 161846611. The next prime is 161846717. The reversal of 161846689 is 986648161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156125025 + 5721664 = 12495^2 + 2392^2 .

It is a cyclic number.

It is not a de Polignac number, because 161846689 - 2¹³ = 161838497 is a prime.

It is not a weakly prime, because it can be changed into another prime (161846089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80923344 + 80923345.

It is an arithmetic number, because the mean of its divisors is an integer number (80923345).

Almost surely, 2^161846689 is an apocalyptic number.

It is an amenable number.

161846689 is a deficient number, since it is larger than the sum of its proper divisors (1).

161846689 is an equidigital number, since it uses as much as digits as its factorization.

161846689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 497664, while the sum is 49.

The square root of 161846689 is about 12721.8980109102. The cubic root of 161846689 is about 544.9641577865.

The spelling of 161846689 in words is "one hundred sixty-one million, eight hundred forty-six thousand, six hundred eighty-nine".