161134609 has 2 divisors, whose sum is σ = 161134610. Its totient is φ = 161134608.

The previous prime is 161134607. The next prime is 161134613. The reversal of 161134609 is 906431161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160579584 + 555025 = 12672^2 + 745^2 .

It is a cyclic number.

It is not a de Polignac number, because 161134609 - 2¹ = 161134607 is a prime.

Together with 161134607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (161134601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80567304 + 80567305.

It is an arithmetic number, because the mean of its divisors is an integer number (80567305).

Almost surely, 2^161134609 is an apocalyptic number.

It is an amenable number.

161134609 is a deficient number, since it is larger than the sum of its proper divisors (1).

161134609 is an equidigital number, since it uses as much as digits as its factorization.

161134609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 161134609 is about 12693.8807698828. The cubic root of 161134609 is about 544.1637530113.

The spelling of 161134609 in words is "one hundred sixty-one million, one hundred thirty-four thousand, six hundred nine".