164521437 has 16 divisors (see below), whose sum is σ = 238872000. Its totient is φ = 100324224.

The previous prime is 164521417. The next prime is 164521447. The reversal of 164521437 is 734125461.

It is not a de Polignac number, because 164521437 - 2¹¹ = 164519389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 164521398 and 164521407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164521417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 48112 + ... + 51417.

It is an arithmetic number, because the mean of its divisors is an integer number (14929500).

Almost surely, 2^164521437 is an apocalyptic number.

It is an amenable number.

164521437 is a deficient number, since it is larger than the sum of its proper divisors (74350563).

164521437 is a wasteful number, since it uses less digits than its factorization.

164521437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99580.

The product of its digits is 20160, while the sum is 33.

The square root of 164521437 is about 12826.5910124242. The cubic root of 164521437 is about 547.9498739826.

Adding to 164521437 its reverse (734125461), we get a palindrome (898646898).

The spelling of 164521437 in words is "one hundred sixty-four million, five hundred twenty-one thousand, four hundred thirty-seven".