167225821 has 16 divisors (see below), whose sum is σ = 213010560. Its totient is φ = 127802880.

The previous prime is 167225819. The next prime is 167225879. The reversal of 167225821 is 128522761.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 167225821 - 2¹ = 167225819 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (167225521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34720 + ... + 39241.

It is an arithmetic number, because the mean of its divisors is an integer number (13313160).

Almost surely, 2^167225821 is an apocalyptic number.

It is an amenable number.

167225821 is a deficient number, since it is larger than the sum of its proper divisors (45784739).

167225821 is a wasteful number, since it uses less digits than its factorization.

167225821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74004.

The product of its digits is 13440, while the sum is 34.

The square root of 167225821 is about 12931.5823084416. The cubic root of 167225821 is about 550.9359501660.

The spelling of 167225821 in words is "one hundred sixty-seven million, two hundred twenty-five thousand, eight hundred twenty-one".