181965055 has 4 divisors (see below), whose sum is σ = 218358072. Its totient is φ = 145572040.

The previous prime is 181964989. The next prime is 181965073. The reversal of 181965055 is 550569181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 550569181 = 331 ⋅1663351.

It is not a de Polignac number, because 181965055 - 2⁹ = 181964543 is a prime.

It is a super-2 number, since 2×181965055² = 66222562482306050, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 181964999 and 181965017.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18196501 + ... + 18196510.

It is an arithmetic number, because the mean of its divisors is an integer number (54589518).

Almost surely, 2^181965055 is an apocalyptic number.

181965055 is a deficient number, since it is larger than the sum of its proper divisors (36393017).

181965055 is an equidigital number, since it uses as much as digits as its factorization.

181965055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36393016.

The product of its (nonzero) digits is 54000, while the sum is 40.

The square root of 181965055 is about 13489.4423531887. The cubic root of 181965055 is about 566.6688383231.

The spelling of 181965055 in words is "one hundred eighty-one million, nine hundred sixty-five thousand, fifty-five".