3691991963 has 4 divisors (see below), whose sum is σ = 4027627608. Its totient is φ = 3356356320.

The previous prime is 3691991959. The next prime is 3691992019.

3691991963 is nontrivially palindromic in base 10.

3691991963 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 3691991963 - 2² = 3691991959 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3691991899 and 3691991908.

It is not an unprimeable number, because it can be changed into a prime (3691991063) 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, 167817806 + ... + 167817827.

It is an arithmetic number, because the mean of its divisors is an integer number (1006906902).

Almost surely, 2^3691991963 is an apocalyptic number.

3691991963 is a deficient number, since it is larger than the sum of its proper divisors (335635645).

3691991963 is a wasteful number, since it uses less digits than its factorization.

3691991963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335635644.

The product of its digits is 2125764, while the sum is 56.

The square root of 3691991963 is about 60761.7639885479. The cubic root of 3691991963 is about 1545.5637233086.

The spelling of 3691991963 in words is "three billion, six hundred ninety-one million, nine hundred ninety-one thousand, nine hundred sixty-three".