3981909013 has 4 divisors (see below), whose sum is σ = 3985264800. Its totient is φ = 3978553228.

The previous prime is 3981909011. The next prime is 3981909023. The reversal of 3981909013 is 3109091893.

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.

It is a cyclic number.

It is not a de Polignac number, because 3981909013 - 2¹ = 3981909011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981909011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1676113 + ... + 1678486.

It is an arithmetic number, because the mean of its divisors is an integer number (996316200).

Almost surely, 2^3981909013 is an apocalyptic number.

It is an amenable number.

3981909013 is a deficient number, since it is larger than the sum of its proper divisors (3355787).

3981909013 is a wasteful number, since it uses less digits than its factorization.

3981909013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3355786.

The product of its (nonzero) digits is 52488, while the sum is 43.

The square root of 3981909013 is about 63102.3693136795. The cubic root of 3981909013 is about 1585.0042973741.

The spelling of 3981909013 in words is "three billion, nine hundred eighty-one million, nine hundred nine thousand, thirteen".