167106721 has 4 divisors (see below), whose sum is σ = 170259732. Its totient is φ = 163953712.

The previous prime is 167106697. The next prime is 167106733. The reversal of 167106721 is 127601761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62331025 + 104775696 = 7895^2 + 10236^2 .

It is a cyclic number.

It is not a de Polignac number, because 167106721 - 2¹⁵ = 167073953 is a prime.

It is a super-3 number, since 3×167106721³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167106791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1576426 + ... + 1576531.

It is an arithmetic number, because the mean of its divisors is an integer number (42564933).

Almost surely, 2^167106721 is an apocalyptic number.

It is an amenable number.

167106721 is a deficient number, since it is larger than the sum of its proper divisors (3153011).

167106721 is an equidigital number, since it uses as much as digits as its factorization.

167106721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3153010.

The product of its (nonzero) digits is 3528, while the sum is 31.

The square root of 167106721 is about 12926.9764833081. The cubic root of 167106721 is about 550.8051249640.

The spelling of 167106721 in words is "one hundred sixty-seven million, one hundred six thousand, seven hundred twenty-one".