164125509 has 4 divisors (see below), whose sum is σ = 218834016. Its totient is φ = 109417004.

The previous prime is 164125499. The next prime is 164125513. The reversal of 164125509 is 905521461.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 164125509 - 2¹¹ = 164123461 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 164125509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164125519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27354249 + ... + 27354254.

It is an arithmetic number, because the mean of its divisors is an integer number (54708504).

Almost surely, 2^164125509 is an apocalyptic number.

It is an amenable number.

164125509 is a deficient number, since it is larger than the sum of its proper divisors (54708507).

164125509 is an equidigital number, since it uses as much as digits as its factorization.

164125509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54708506.

The product of its (nonzero) digits is 10800, while the sum is 33.

The square root of 164125509 is about 12811.1478408455. The cubic root of 164125509 is about 547.5099658326.

The spelling of 164125509 in words is "one hundred sixty-four million, one hundred twenty-five thousand, five hundred nine".