164171972 has 6 divisors (see below), whose sum is σ = 287300958. Its totient is φ = 82085984.

The previous prime is 164171957. The next prime is 164172017. The reversal of 164171972 is 279171461.

It can be written as a sum of positive squares in only one way, i.e., 162970756 + 1201216 = 12766^2 + 1096^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20521493 + ... + 20521500.

It is an arithmetic number, because the mean of its divisors is an integer number (47883493).

Almost surely, 2^164171972 is an apocalyptic number.

It is an amenable number.

164171972 is a deficient number, since it is larger than the sum of its proper divisors (123128986).

164171972 is a wasteful number, since it uses less digits than its factorization.

164171972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41042997 (or 41042995 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 164171972 is about 12812.9610941421. The cubic root of 164171972 is about 547.5616266125.

The spelling of 164171972 in words is "one hundred sixty-four million, one hundred seventy-one thousand, nine hundred seventy-two".