161397073 has 2 divisors, whose sum is σ = 161397074. Its totient is φ = 161397072.

The previous prime is 161397023. The next prime is 161397143. The reversal of 161397073 is 370793161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142491969 + 18905104 = 11937^2 + 4348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161397073 is a prime.

It is not a weakly prime, because it can be changed into another prime (161397023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80698536 + 80698537.

It is an arithmetic number, because the mean of its divisors is an integer number (80698537).

Almost surely, 2^161397073 is an apocalyptic number.

It is an amenable number.

161397073 is a deficient number, since it is larger than the sum of its proper divisors (1).

161397073 is an equidigital number, since it uses as much as digits as its factorization.

161397073 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 37.

The square root of 161397073 is about 12704.2147730586. The cubic root of 161397073 is about 544.4590463281.

The spelling of 161397073 in words is "one hundred sixty-one million, three hundred ninety-seven thousand, seventy-three".