164121505 has 8 divisors (see below), whose sum is σ = 197121024. Its totient is φ = 131180400.

The previous prime is 164121481. The next prime is 164121511. The reversal of 164121505 is 505121461.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-164121505 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 164121505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8161 + ... + 19870.

It is an arithmetic number, because the mean of its divisors is an integer number (24640128).

Almost surely, 2^164121505 is an apocalyptic number.

It is an amenable number.

164121505 is a deficient number, since it is larger than the sum of its proper divisors (32999519).

164121505 is a wasteful number, since it uses less digits than its factorization.

164121505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29207.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 164121505 is about 12810.9915697420. The cubic root of 164121505 is about 547.5055134520.

Adding to 164121505 its reverse (505121461), we get a palindrome (669242966).

The spelling of 164121505 in words is "one hundred sixty-four million, one hundred twenty-one thousand, five hundred five".