164443531 has 8 divisors (see below), whose sum is σ = 188495840. Its totient is φ = 140531328.

The previous prime is 164443529. The next prime is 164443547. The reversal of 164443531 is 135344461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 164443531 - 2¹ = 164443529 is a prime.

It is a super-2 number, since 2×164443531² = 54083349775495922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164443493 and 164443502.

It is not an unprimeable number, because it can be changed into a prime (164443571) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32496 + ... + 37213.

It is an arithmetic number, because the mean of its divisors is an integer number (23561980).

Almost surely, 2^164443531 is an apocalyptic number.

164443531 is a deficient number, since it is larger than the sum of its proper divisors (24052309).

164443531 is an equidigital number, since it uses as much as digits as its factorization.

164443531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70053.

The product of its digits is 17280, while the sum is 31.

The square root of 164443531 is about 12823.5537586115. The cubic root of 164443531 is about 547.8633699104.

Adding to 164443531 its reverse (135344461), we get a palindrome (299787992).

The spelling of 164443531 in words is "one hundred sixty-four million, four hundred forty-three thousand, five hundred thirty-one".