164544881 has 4 divisors (see below), whose sum is σ = 164872512. Its totient is φ = 164217252.

The previous prime is 164544871. The next prime is 164544893. The reversal of 164544881 is 188445461.

It is a happy number.

164544881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 188445461 = 2609 ⋅72229.

It is a cyclic number.

It is not a de Polignac number, because 164544881 - 2²² = 160350577 is a prime.

It is a super-2 number, since 2×164544881² = 54150035726608322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164544871) 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, 163061 + ... + 164066.

It is an arithmetic number, because the mean of its divisors is an integer number (41218128).

Almost surely, 2^164544881 is an apocalyptic number.

It is an amenable number.

164544881 is a deficient number, since it is larger than the sum of its proper divisors (327631).

164544881 is an equidigital number, since it uses as much as digits as its factorization.

164544881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327630.

The product of its digits is 122880, while the sum is 41.

The square root of 164544881 is about 12827.5048625990. The cubic root of 164544881 is about 547.9759000270.

The spelling of 164544881 in words is "one hundred sixty-four million, five hundred forty-four thousand, eight hundred eighty-one".