161751329 has 2 divisors, whose sum is σ = 161751330. Its totient is φ = 161751328.

The previous prime is 161751319. The next prime is 161751361. The reversal of 161751329 is 923157161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159264400 + 2486929 = 12620^2 + 1577^2 .

It is a cyclic number.

It is not a de Polignac number, because 161751329 - 2¹² = 161747233 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161751319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80875664 + 80875665.

It is an arithmetic number, because the mean of its divisors is an integer number (80875665).

Almost surely, 2^161751329 is an apocalyptic number.

It is an amenable number.

161751329 is a deficient number, since it is larger than the sum of its proper divisors (1).

161751329 is an equidigital number, since it uses as much as digits as its factorization.

161751329 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 161751329 is about 12718.1495902509. The cubic root of 161751329 is about 544.8571058758.

The spelling of 161751329 in words is "one hundred sixty-one million, seven hundred fifty-one thousand, three hundred twenty-nine".