3981988609 has 3 divisors (see below), whose sum is σ = 3982051713. Its totient is φ = 3981925506.

The previous prime is 3981988603. The next prime is 3981988627. The reversal of 3981988609 is 9068891893.

The square root of 3981988609 is 63103.

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 3981988609 - 2⁷ = 3981988481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981988603) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 31552 + ... + 94654.

It is an arithmetic number, because the mean of its divisors is an integer number (1327350571).

Almost surely, 2^3981988609 is an apocalyptic number.

3981988609 is the 63103-rd square number.

3981988609 is the 31552-nd centered octagonal number.

It is an amenable number.

3981988609 is a deficient number, since it is larger than the sum of its proper divisors (63104).

3981988609 is an frugal number, since it uses more digits than its factorization.

3981988609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126206 (or 63103 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 61.

The cubic root of 3981988609 is about 1585.0148584024.

The spelling of 3981988609 in words is "three billion, nine hundred eighty-one million, nine hundred eighty-eight thousand, six hundred nine".