4609187881 has 3 divisors (see below), whose sum is σ = 4609255773. Its totient is φ = 4609119990.

The previous prime is 4609187867. The next prime is 4609187893. The reversal of 4609187881 is 1887819064.

It is a happy number.

The square root of 4609187881 is 67891.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 4609187881 - 2³¹ = 2461704233 is a prime.

It is a super-2 number, since 2×4609187881² = 42489225844714540322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4609187851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 33946 + ... + 101836.

It is an arithmetic number, because the mean of its divisors is an integer number (1536418591).

Almost surely, 2^4609187881 is an apocalyptic number.

4609187881 is the 67891-st square number.

4609187881 is the 33946-th centered octagonal number.

It is an amenable number.

4609187881 is a deficient number, since it is larger than the sum of its proper divisors (67892).

4609187881 is an frugal number, since it uses more digits than its factorization.

4609187881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135782 (or 67891 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 52.

The cubic root of 4609187881 is about 1664.2100375944.

The spelling of 4609187881 in words is "four billion, six hundred nine million, one hundred eighty-seven thousand, eight hundred eighty-one".