164871545 has 4 divisors (see below), whose sum is σ = 197845860. Its totient is φ = 131897232.

The previous prime is 164871541. The next prime is 164871557. The reversal of 164871545 is 545178461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 545178461 = 37 ⋅14734553.

It can be written as a sum of positive squares in 2 ways, for example, as 70023424 + 94848121 = 8368^2 + 9739^2 .

It is a cyclic number.

It is not a de Polignac number, because 164871545 - 2² = 164871541 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (164871541) 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, 16487150 + ... + 16487159.

It is an arithmetic number, because the mean of its divisors is an integer number (49461465).

Almost surely, 2^164871545 is an apocalyptic number.

It is an amenable number.

164871545 is a deficient number, since it is larger than the sum of its proper divisors (32974315).

164871545 is an equidigital number, since it uses as much as digits as its factorization.

164871545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32974314.

The product of its digits is 134400, while the sum is 41.

The square root of 164871545 is about 12840.2315010283. The cubic root of 164871545 is about 548.3382847909.

The spelling of 164871545 in words is "one hundred sixty-four million, eight hundred seventy-one thousand, five hundred forty-five".