3961681919 has 4 divisors (see below), whose sum is σ = 4266426696. Its totient is φ = 3656937144.

The previous prime is 3961681907. The next prime is 3961681931. The reversal of 3961681919 is 9191861693.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (3961681907) and next prime (3961681931).

It is a cyclic number.

It is not a de Polignac number, because 3961681919 - 2⁴ = 3961681903 is a prime.

It is a super-2 number, since 2×3961681919² = 31389847254663045122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3961681939) 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, 152372369 + ... + 152372394.

It is an arithmetic number, because the mean of its divisors is an integer number (1066606674).

Almost surely, 2^3961681919 is an apocalyptic number.

3961681919 is a deficient number, since it is larger than the sum of its proper divisors (304744777).

3961681919 is a wasteful number, since it uses less digits than its factorization.

3961681919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304744776.

The product of its digits is 629856, while the sum is 53.

The square root of 3961681919 is about 62941.8931952321. The cubic root of 3961681919 is about 1582.3159327269.

The spelling of 3961681919 in words is "three billion, nine hundred sixty-one million, six hundred eighty-one thousand, nine hundred nineteen".