161371081 has 2 divisors, whose sum is σ = 161371082. Its totient is φ = 161371080.

The previous prime is 161371079. The next prime is 161371117. The reversal of 161371081 is 180173161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 151511481 + 9859600 = 12309^2 + 3140^2 .

It is a cyclic number.

It is not a de Polignac number, because 161371081 - 2¹ = 161371079 is a prime.

It is a super-2 number, since 2×161371081² = 52081251566217122, which contains 22 as substring.

Together with 161371079, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161371031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80685540 + 80685541.

It is an arithmetic number, because the mean of its divisors is an integer number (80685541).

Almost surely, 2^161371081 is an apocalyptic number.

It is an amenable number.

161371081 is a deficient number, since it is larger than the sum of its proper divisors (1).

161371081 is an equidigital number, since it uses as much as digits as its factorization.

161371081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 161371081 is about 12703.1917642772. The cubic root of 161371081 is about 544.4298175054.

The spelling of 161371081 in words is "one hundred sixty-one million, three hundred seventy-one thousand, eighty-one".