161026081 has 4 divisors (see below), whose sum is σ = 161078164. Its totient is φ = 160974000.

The previous prime is 161026069. The next prime is 161026133. The reversal of 161026081 is 180620161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 16810000 + 144216081 = 4100^2 + 12009^2 .

It is a cyclic number.

It is not a de Polignac number, because 161026081 - 2⁵ = 161026049 is a prime.

It is a super-2 number, since 2×161026081² = 51858797524437122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161026181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21090 + ... + 27691.

It is an arithmetic number, because the mean of its divisors is an integer number (40269541).

Almost surely, 2^161026081 is an apocalyptic number.

It is an amenable number.

161026081 is a deficient number, since it is larger than the sum of its proper divisors (52083).

161026081 is an equidigital number, since it uses as much as digits as its factorization.

161026081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52082.

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

The square root of 161026081 is about 12689.6052342065. The cubic root of 161026081 is about 544.0415564869.

The spelling of 161026081 in words is "one hundred sixty-one million, twenty-six thousand, eighty-one".