164881709 has 4 divisors (see below), whose sum is σ = 166140480. Its totient is φ = 163622940.

The previous prime is 164881697. The next prime is 164881729. The reversal of 164881709 is 907188461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 907188461 = 1607 ⋅564523.

It is a cyclic number.

It is not a de Polignac number, because 164881709 - 2⁴ = 164881693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 164881709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164881729) 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, 629189 + ... + 629450.

It is an arithmetic number, because the mean of its divisors is an integer number (41535120).

Almost surely, 2^164881709 is an apocalyptic number.

It is an amenable number.

164881709 is a deficient number, since it is larger than the sum of its proper divisors (1258771).

164881709 is a wasteful number, since it uses less digits than its factorization.

164881709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1258770.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 164881709 is about 12840.6272821852. The cubic root of 164881709 is about 548.3495525444.

The spelling of 164881709 in words is "one hundred sixty-four million, eight hundred eighty-one thousand, seven hundred nine".