164413881 has 10 divisors (see below), whose sum is σ = 245606042. Its totient is φ = 109609200.

The previous prime is 164413877. The next prime is 164413889. The reversal of 164413881 is 188314461.

It is a happy number.

164413881 is a `hidden beast` number, since 1 + 644 + 1 + 3 + 8 + 8 + 1 = 666.

164413881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 164249856 + 164025 = 12816^2 + 405^2 .

It is not a de Polignac number, because 164413881 - 2² = 164413877 is a prime.

It is a super-3 number, since 3×164413881³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (164413889) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1014820 + ... + 1014981.

Almost surely, 2^164413881 is an apocalyptic number.

It is an amenable number.

164413881 is a deficient number, since it is larger than the sum of its proper divisors (81192161).

164413881 is an equidigital number, since it uses as much as digits as its factorization.

164413881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2029813 (or 2029804 counting only the distinct ones).

The product of its digits is 18432, while the sum is 36.

The square root of 164413881 is about 12822.3976307085. The cubic root of 164413881 is about 547.8304404194.

The spelling of 164413881 in words is "one hundred sixty-four million, four hundred thirteen thousand, eight hundred eighty-one".