2136172181 has 8 divisors (see below), whose sum is σ = 2509629024. Its totient is φ = 1792591920.

The previous prime is 2136172151. The next prime is 2136172267. The reversal of 2136172181 is 1812716312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2136172181 - 2¹⁸ = 2135910037 is a prime.

It is a super-2 number, since 2×2136172181² = 9126463173756593522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2136172151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7468991 + ... + 7469276.

It is an arithmetic number, because the mean of its divisors is an integer number (313703628).

Almost surely, 2^2136172181 is an apocalyptic number.

It is an amenable number.

2136172181 is a deficient number, since it is larger than the sum of its proper divisors (373456843).

2136172181 is a wasteful number, since it uses less digits than its factorization.

2136172181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14938291.

The product of its digits is 4032, while the sum is 32.

The square root of 2136172181 is about 46218.7427457736. The cubic root of 2136172181 is about 1287.8899424771.

Adding to 2136172181 its reverse (1812716312), we get a palindrome (3948888493).

The spelling of 2136172181 in words is "two billion, one hundred thirty-six million, one hundred seventy-two thousand, one hundred eighty-one".