164443501 has 4 divisors (see below), whose sum is σ = 166424832. Its totient is φ = 162462172.

The previous prime is 164443463. The next prime is 164443507. The reversal of 164443501 is 105344461.

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, and also an emirpimes, since its reverse is a distinct semiprime: 105344461 = 17 ⋅6196733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-164443501 is a prime.

It is a super-2 number, since 2×164443501² = 54083330042274002, which contains 22 as substring.

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 164443501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164443507) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 990541 + ... + 990706.

It is an arithmetic number, because the mean of its divisors is an integer number (41606208).

Almost surely, 2^164443501 is an apocalyptic number.

It is an amenable number.

164443501 is a deficient number, since it is larger than the sum of its proper divisors (1981331).

164443501 is an equidigital number, since it uses as much as digits as its factorization.

164443501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1981330.

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 164443501 is about 12823.5525888889. The cubic root of 164443501 is about 547.8633365942.

Adding to 164443501 its reverse (105344461), we get a palindrome (269787962).

The spelling of 164443501 in words is "one hundred sixty-four million, four hundred forty-three thousand, five hundred one".