3219964601991 has 4 divisors (see below), whose sum is σ = 4293286135992. Its totient is φ = 2146643067992.

The previous prime is 3219964601977. The next prime is 3219964602037. The reversal of 3219964601991 is 1991064699123.

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 3219964601991 - 2¹⁸ = 3219964339847 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3219964601911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536660766996 + ... + 536660767001.

It is an arithmetic number, because the mean of its divisors is an integer number (1073321533998).

Almost surely, 2^{3219964601991} is an apocalyptic number.

3219964601991 is a deficient number, since it is larger than the sum of its proper divisors (1073321534001).

3219964601991 is a wasteful number, since it uses less digits than its factorization.

3219964601991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073321534000.

The product of its (nonzero) digits is 5668704, while the sum is 60.

The spelling of 3219964601991 in words is "three trillion, two hundred nineteen billion, nine hundred sixty-four million, six hundred one thousand, nine hundred ninety-one".