181020061 has 4 divisors (see below), whose sum is σ = 181199772. Its totient is φ = 180840352.

The previous prime is 181020041. The next prime is 181020079. The reversal of 181020061 is 160020181.

181020061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 70644025 + 110376036 = 8405^2 + 10506^2 .

It is a cyclic number.

It is not a de Polignac number, because 181020061 - 2⁷ = 181019933 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181020031) 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, 88336 + ... + 90361.

It is an arithmetic number, because the mean of its divisors is an integer number (45299943).

Almost surely, 2^181020061 is an apocalyptic number.

It is an amenable number.

181020061 is a deficient number, since it is larger than the sum of its proper divisors (179711).

181020061 is a wasteful number, since it uses less digits than its factorization.

181020061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179710.

The product of its (nonzero) digits is 96, while the sum is 19.

The square root of 181020061 is about 13454.3695876098. The cubic root of 181020061 is about 565.6861801735.

The spelling of 181020061 in words is "one hundred eighty-one million, twenty thousand, sixty-one".