161132281 has 2 divisors, whose sum is σ = 161132282. Its totient is φ = 161132280.

The previous prime is 161132261. The next prime is 161132291. The reversal of 161132281 is 182231161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131331600 + 29800681 = 11460^2 + 5459^2 .

It is a cyclic number.

It is not a de Polignac number, because 161132281 - 2⁵ = 161132249 is a prime.

It is a super-2 number, since 2×161132281² = 51927223960525922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161132201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80566140 + 80566141.

It is an arithmetic number, because the mean of its divisors is an integer number (80566141).

Almost surely, 2^161132281 is an apocalyptic number.

It is an amenable number.

161132281 is a deficient number, since it is larger than the sum of its proper divisors (1).

161132281 is an equidigital number, since it uses as much as digits as its factorization.

161132281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576, while the sum is 25.

The square root of 161132281 is about 12693.7890718256. The cubic root of 161132281 is about 544.1611323880.

The spelling of 161132281 in words is "one hundred sixty-one million, one hundred thirty-two thousand, two hundred eighty-one".