164391531 has 16 divisors (see below), whose sum is σ = 224729856. Its totient is φ = 106850016.

The previous prime is 164391503. The next prime is 164391533. The reversal of 164391531 is 135193461.

It is not a de Polignac number, because 164391531 - 2⁵ = 164391499 is a prime.

It is a super-2 number, since 2×164391531² = 54049150929047922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 164391492 and 164391501.

It is not an unprimeable number, because it can be changed into a prime (164391533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22746 + ... + 29088.

It is an arithmetic number, because the mean of its divisors is an integer number (14045616).

Almost surely, 2^164391531 is an apocalyptic number.

164391531 is a deficient number, since it is larger than the sum of its proper divisors (60338325).

164391531 is a wasteful number, since it uses less digits than its factorization.

164391531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6562.

The product of its digits is 9720, while the sum is 33.

The square root of 164391531 is about 12821.5260792154. The cubic root of 164391531 is about 547.8056157409.

The spelling of 164391531 in words is "one hundred sixty-four million, three hundred ninety-one thousand, five hundred thirty-one".