167471721 has 6 divisors (see below), whose sum is σ = 241903610. Its totient is φ = 111647808.

The previous prime is 167471701. The next prime is 167471741. The reversal of 167471721 is 127174761.

167471721 is a `hidden beast` number, since 167 + 471 + 7 + 21 = 666.

It is an interprime number because it is at equal distance from previous prime (167471701) and next prime (167471741).

It can be written as a sum of positive squares in only one way, i.e., 150332121 + 17139600 = 12261^2 + 4140^2 .

It is not a de Polignac number, because 167471721 - 2⁹ = 167471209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167471701) 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 5 ways as a sum of consecutive naturals, for example, 9303976 + ... + 9303993.

Almost surely, 2^167471721 is an apocalyptic number.

It is an amenable number.

167471721 is a deficient number, since it is larger than the sum of its proper divisors (74431889).

167471721 is a wasteful number, since it uses less digits than its factorization.

167471721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18607975 (or 18607972 counting only the distinct ones).

The product of its digits is 16464, while the sum is 36.

The square root of 167471721 is about 12941.0865463453. The cubic root of 167471721 is about 551.2058622319.

The spelling of 167471721 in words is "one hundred sixty-seven million, four hundred seventy-one thousand, seven hundred twenty-one".