167061721 has 4 divisors (see below), whose sum is σ = 172822500. Its totient is φ = 161300944.

The previous prime is 167061709. The next prime is 167061743. The reversal of 167061721 is 127160761.

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 34351321 + 132710400 = 5861^2 + 11520^2 .

It is a cyclic number.

It is not a de Polignac number, because 167061721 - 2⁵ = 167061689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (167061761) 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, 2880346 + ... + 2880403.

It is an arithmetic number, because the mean of its divisors is an integer number (43205625).

Almost surely, 2^167061721 is an apocalyptic number.

It is an amenable number.

167061721 is a deficient number, since it is larger than the sum of its proper divisors (5760779).

167061721 is an equidigital number, since it uses as much as digits as its factorization.

167061721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5760778.

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

The square root of 167061721 is about 12925.2358198990. The cubic root of 167061721 is about 550.7556786068.

The spelling of 167061721 in words is "one hundred sixty-seven million, sixty-one thousand, seven hundred twenty-one".