161042281 has 2 divisors, whose sum is σ = 161042282. Its totient is φ = 161042280.

The previous prime is 161042261. The next prime is 161042359. The reversal of 161042281 is 182240161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101505625 + 59536656 = 10075^2 + 7716^2 .

It is a cyclic number.

It is not a de Polignac number, because 161042281 - 2⁷ = 161042153 is a prime.

It is a super-2 number, since 2×161042281² = 51869232539365922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161042201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80521140 + 80521141.

It is an arithmetic number, because the mean of its divisors is an integer number (80521141).

Almost surely, 2^161042281 is an apocalyptic number.

It is an amenable number.

161042281 is a deficient number, since it is larger than the sum of its proper divisors (1).

161042281 is an equidigital number, since it uses as much as digits as its factorization.

161042281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 161042281 is about 12690.2435358822. The cubic root of 161042281 is about 544.0598002762.

The spelling of 161042281 in words is "one hundred sixty-one million, forty-two thousand, two hundred eighty-one".