164872921 has 8 divisors (see below), whose sum is σ = 167973120. Its totient is φ = 161798208.

The previous prime is 164872913. The next prime is 164872927. The reversal of 164872921 is 129278461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 164872921 - 2³ = 164872913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164872927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6945 + ... + 19441.

It is an arithmetic number, because the mean of its divisors is an integer number (20996640).

Almost surely, 2^164872921 is an apocalyptic number.

It is an amenable number.

164872921 is a deficient number, since it is larger than the sum of its proper divisors (3100199).

164872921 is a wasteful number, since it uses less digits than its factorization.

164872921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12743.

The product of its digits is 48384, while the sum is 40.

The square root of 164872921 is about 12840.2850825050. The cubic root of 164872921 is about 548.3398102439.

The spelling of 164872921 in words is "one hundred sixty-four million, eight hundred seventy-two thousand, nine hundred twenty-one".