161272073 has 2 divisors, whose sum is σ = 161272074. Its totient is φ = 161272072.

The previous prime is 161272043. The next prime is 161272099. The reversal of 161272073 is 370272161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 156550144 + 4721929 = 12512^2 + 2173^2 .

It is a cyclic number.

It is not a de Polignac number, because 161272073 - 2¹⁶ = 161206537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (161272043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80636036 + 80636037.

It is an arithmetic number, because the mean of its divisors is an integer number (80636037).

Almost surely, 2^161272073 is an apocalyptic number.

It is an amenable number.

161272073 is a deficient number, since it is larger than the sum of its proper divisors (1).

161272073 is an equidigital number, since it uses as much as digits as its factorization.

161272073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3528, while the sum is 29.

The square root of 161272073 is about 12699.2941929857. The cubic root of 161272073 is about 544.3184511344.

The spelling of 161272073 in words is "one hundred sixty-one million, two hundred seventy-two thousand, seventy-three".