181992061 has 4 divisors (see below), whose sum is σ = 182997724. Its totient is φ = 180986400.

The previous prime is 181992053. The next prime is 181992113. The reversal of 181992061 is 160299181.

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 22752900 + 159239161 = 4770^2 + 12619^2 .

It is a cyclic number.

It is not a de Polignac number, because 181992061 - 2³ = 181992053 is a prime.

It is a super-3 number, since 3×181992061³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 181992061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181993061) 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, 502560 + ... + 502921.

It is an arithmetic number, because the mean of its divisors is an integer number (45749431).

Almost surely, 2^181992061 is an apocalyptic number.

It is an amenable number.

181992061 is a deficient number, since it is larger than the sum of its proper divisors (1005663).

181992061 is a wasteful number, since it uses less digits than its factorization.

181992061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1005662.

The product of its (nonzero) digits is 7776, while the sum is 37.

The square root of 181992061 is about 13490.4433211070. The cubic root of 181992061 is about 566.6968706315.

The spelling of 181992061 in words is "one hundred eighty-one million, nine hundred ninety-two thousand, sixty-one".