168181947 has 8 divisors (see below), whose sum is σ = 249158480. Its totient is φ = 112121280.

The previous prime is 168181931. The next prime is 168181961. The reversal of 168181947 is 749181861.

It is a happy number.

It is not a de Polignac number, because 168181947 - 2⁴ = 168181931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168181927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3114454 + ... + 3114507.

It is an arithmetic number, because the mean of its divisors is an integer number (31144810).

Almost surely, 2^168181947 is an apocalyptic number.

168181947 is a deficient number, since it is larger than the sum of its proper divisors (80976533).

168181947 is an equidigital number, since it uses as much as digits as its factorization.

168181947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6228970 (or 6228964 counting only the distinct ones).

The product of its digits is 96768, while the sum is 45.

The square root of 168181947 is about 12968.4982553879. The cubic root of 168181947 is about 551.9839610179.

It can be divided in two parts, 16818194 and 7, that added together give a square (16818201 = 4101²).

The spelling of 168181947 in words is "one hundred sixty-eight million, one hundred eighty-one thousand, nine hundred forty-seven".