161464409 has 2 divisors, whose sum is σ = 161464410. Its totient is φ = 161464408.

The previous prime is 161464403. The next prime is 161464463. The reversal of 161464409 is 904464161.

It is a happy number.

161464409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122589184 + 38875225 = 11072^2 + 6235^2 .

It is a cyclic number.

It is not a de Polignac number, because 161464409 - 2¹⁶ = 161398873 is a prime.

It is not a weakly prime, because it can be changed into another prime (161464403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80732204 + 80732205.

It is an arithmetic number, because the mean of its divisors is an integer number (80732205).

Almost surely, 2^161464409 is an apocalyptic number.

It is an amenable number.

161464409 is a deficient number, since it is larger than the sum of its proper divisors (1).

161464409 is an equidigital number, since it uses as much as digits as its factorization.

161464409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 161464409 is about 12706.8646408152. The cubic root of 161464409 is about 544.5347531885.

The spelling of 161464409 in words is "one hundred sixty-one million, four hundred sixty-four thousand, four hundred nine".