181972130 has 16 divisors (see below), whose sum is σ = 335168064. Its totient is φ = 71095920.

The previous prime is 181972123. The next prime is 181972157. The reversal of 181972130 is 31279181.

It is a super-2 number, since 2×181972130² = 66227712193473800, which contains 22 as substring.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 211166 + ... + 212025.

It is an arithmetic number, because the mean of its divisors is an integer number (20948004).

Almost surely, 2^181972130 is an apocalyptic number.

181972130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181972130 is a deficient number, since it is larger than the sum of its proper divisors (153195934).

181972130 is a wasteful number, since it uses less digits than its factorization.

181972130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423241.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 181972130 is about 13489.7045927626. The cubic root of 181972130 is about 566.6761824623.

It can be divided in two parts, 18197 and 2130, that multiplied together give a triangular number (38759610 = T₈₈₀₄).

The spelling of 181972130 in words is "one hundred eighty-one million, nine hundred seventy-two thousand, one hundred thirty".