164443491 has 12 divisors (see below), whose sum is σ = 247857168. Its totient is φ = 104862384.

The previous prime is 164443463. The next prime is 164443507. The reversal of 164443491 is 194344461.

It is a happy number.

164443491 is a `hidden beast` number, since 1 + 644 + 4 + 3 + 4 + 9 + 1 = 666.

It is not a de Polignac number, because 164443491 - 2⁹ = 164442979 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (164443291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 397000 + ... + 397413.

It is an arithmetic number, because the mean of its divisors is an integer number (20654764).

Almost surely, 2^164443491 is an apocalyptic number.

164443491 is a deficient number, since it is larger than the sum of its proper divisors (83413677).

164443491 is a wasteful number, since it uses less digits than its factorization.

164443491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794442 (or 794439 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 164443491 is about 12823.5521989814. The cubic root of 164443491 is about 547.8633254888.

The spelling of 164443491 in words is "one hundred sixty-four million, four hundred forty-three thousand, four hundred ninety-one".