164615421 has 4 divisors (see below), whose sum is σ = 219487232. Its totient is φ = 109743612.

The previous prime is 164615419. The next prime is 164615431. The reversal of 164615421 is 124516461.

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 not a de Polignac number, because 164615421 - 2¹ = 164615419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164615431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27435901 + ... + 27435906.

It is an arithmetic number, because the mean of its divisors is an integer number (54871808).

Almost surely, 2^164615421 is an apocalyptic number.

It is an amenable number.

164615421 is a deficient number, since it is larger than the sum of its proper divisors (54871811).

164615421 is an equidigital number, since it uses as much as digits as its factorization.

164615421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54871810.

The product of its digits is 5760, while the sum is 30.

The square root of 164615421 is about 12830.2541284263. The cubic root of 164615421 is about 548.0541941626.

The spelling of 164615421 in words is "one hundred sixty-four million, six hundred fifteen thousand, four hundred twenty-one".