161026181 has 2 divisors, whose sum is σ = 161026182. Its totient is φ = 161026180.

The previous prime is 161026171. The next prime is 161026189. The reversal of 161026181 is 181620161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139948900 + 21077281 = 11830^2 + 4591^2 .

It is a cyclic number.

It is not a de Polignac number, because 161026181 - 2¹⁰ = 161025157 is a prime.

It is a super-2 number, since 2×161026181² = 51858861934889522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161026181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161026189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80513090 + 80513091.

It is an arithmetic number, because the mean of its divisors is an integer number (80513091).

Almost surely, 2^161026181 is an apocalyptic number.

It is an amenable number.

161026181 is a deficient number, since it is larger than the sum of its proper divisors (1).

161026181 is an equidigital number, since it uses as much as digits as its factorization.

161026181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 161026181 is about 12689.6091744387. The cubic root of 161026181 is about 544.0416691067.

The spelling of 161026181 in words is "one hundred sixty-one million, twenty-six thousand, one hundred eighty-one".