181969101 has 24 divisors (see below), whose sum is σ = 277115904. Its totient is φ = 114893280.

The previous prime is 181969091. The next prime is 181969121. The reversal of 181969101 is 101969181.

It is not a de Polignac number, because 181969101 - 2¹⁰ = 181968077 is a prime.

It is a super-2 number, since 2×181969101² = 66225507437496402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181969121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6175 + ... + 20051.

It is an arithmetic number, because the mean of its divisors is an integer number (11546496).

Almost surely, 2^181969101 is an apocalyptic number.

It is an amenable number.

181969101 is a deficient number, since it is larger than the sum of its proper divisors (95146803).

181969101 is a wasteful number, since it uses less digits than its factorization.

181969101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13961 (or 13958 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 36.

The square root of 181969101 is about 13489.5923214899. The cubic root of 181969101 is about 566.6730382598.

The spelling of 181969101 in words is "one hundred eighty-one million, nine hundred sixty-nine thousand, one hundred one".