161606453 has 2 divisors, whose sum is σ = 161606454. Its totient is φ = 161606452.

The previous prime is 161606449. The next prime is 161606519. The reversal of 161606453 is 354606161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94906564 + 66699889 = 9742^2 + 8167^2 .

It is a cyclic number.

It is not a de Polignac number, because 161606453 - 2² = 161606449 is a prime.

It is a super-2 number, since 2×161606453² = 52233291302482418, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161606413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80803226 + 80803227.

It is an arithmetic number, because the mean of its divisors is an integer number (80803227).

Almost surely, 2^161606453 is an apocalyptic number.

It is an amenable number.

161606453 is a deficient number, since it is larger than the sum of its proper divisors (1).

161606453 is an equidigital number, since it uses as much as digits as its factorization.

161606453 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 161606453 is about 12712.4526744448. The cubic root of 161606453 is about 544.6943863536.

The spelling of 161606453 in words is "one hundred sixty-one million, six hundred six thousand, four hundred fifty-three".