181166051 has 4 divisors (see below), whose sum is σ = 197635704. Its totient is φ = 164696400.

The previous prime is 181166047. The next prime is 181166053. The reversal of 181166051 is 150661181.

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

It is not a de Polignac number, because 181166051 - 2² = 181166047 is a prime.

It is a super-2 number, since 2×181166051² = 65642276069869202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (181166053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8234810 + ... + 8234831.

It is an arithmetic number, because the mean of its divisors is an integer number (49408926).

Almost surely, 2^181166051 is an apocalyptic number.

181166051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

181166051 is a deficient number, since it is larger than the sum of its proper divisors (16469653).

181166051 is a wasteful number, since it uses less digits than its factorization.

181166051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16469652.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 181166051 is about 13459.7938691497. The cubic root of 181166051 is about 565.8382118210.

The spelling of 181166051 in words is "one hundred eighty-one million, one hundred sixty-six thousand, fifty-one".