161925317 has 2 divisors, whose sum is σ = 161925318. Its totient is φ = 161925316.

The previous prime is 161925287. The next prime is 161925343. The reversal of 161925317 is 713529161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159617956 + 2307361 = 12634^2 + 1519^2 .

It is a cyclic number.

It is not a de Polignac number, because 161925317 - 2¹⁴ = 161908933 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161925367) 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, 80962658 + 80962659.

It is an arithmetic number, because the mean of its divisors is an integer number (80962659).

Almost surely, 2^161925317 is an apocalyptic number.

It is an amenable number.

161925317 is a deficient number, since it is larger than the sum of its proper divisors (1).

161925317 is an equidigital number, since it uses as much as digits as its factorization.

161925317 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11340, while the sum is 35.

The square root of 161925317 is about 12724.9878978331. The cubic root of 161925317 is about 545.0523945924.

The spelling of 161925317 in words is "one hundred sixty-one million, nine hundred twenty-five thousand, three hundred seventeen".