161537273 has 2 divisors, whose sum is σ = 161537274. Its totient is φ = 161537272.

The previous prime is 161537231. The next prime is 161537291. The reversal of 161537273 is 372735161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102677689 + 58859584 = 10133^2 + 7672^2 .

It is a cyclic number.

It is not a de Polignac number, because 161537273 - 2⁶ = 161537209 is a prime.

It is not a weakly prime, because it can be changed into another prime (161537293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80768636 + 80768637.

It is an arithmetic number, because the mean of its divisors is an integer number (80768637).

Almost surely, 2^161537273 is an apocalyptic number.

It is an amenable number.

161537273 is a deficient number, since it is larger than the sum of its proper divisors (1).

161537273 is an equidigital number, since it uses as much as digits as its factorization.

161537273 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26460, while the sum is 35.

The square root of 161537273 is about 12709.7314291058. The cubic root of 161537273 is about 544.6166515537.

The spelling of 161537273 in words is "one hundred sixty-one million, five hundred thirty-seven thousand, two hundred seventy-three".