161758049 has 2 divisors, whose sum is σ = 161758050. Its totient is φ = 161758048.

The previous prime is 161758013. The next prime is 161758061. The reversal of 161758049 is 940857161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105987025 + 55771024 = 10295^2 + 7468^2 .

It is a cyclic number.

It is not a de Polignac number, because 161758049 - 2²⁰ = 160709473 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161757997 and 161758015.

It is not a weakly prime, because it can be changed into another prime (161758099) 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, 80879024 + 80879025.

It is an arithmetic number, because the mean of its divisors is an integer number (80879025).

Almost surely, 2^161758049 is an apocalyptic number.

It is an amenable number.

161758049 is a deficient number, since it is larger than the sum of its proper divisors (1).

161758049 is an equidigital number, since it uses as much as digits as its factorization.

161758049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 161758049 is about 12718.4137768827. The cubic root of 161758049 is about 544.8646511802.

The spelling of 161758049 in words is "one hundred sixty-one million, seven hundred fifty-eight thousand, forty-nine".