3921516601 has 4 divisors (see below), whose sum is σ = 3924357604. Its totient is φ = 3918675600.

The previous prime is 3921516589. The next prime is 3921516649. The reversal of 3921516601 is 1066151293.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1066151293 = 1181 ⋅902753.

It can be written as a sum of positive squares in 2 ways, for example, as 832380201 + 3089136400 = 28851^2 + 55580^2 .

It is a cyclic number.

It is not a de Polignac number, because 3921516601 - 2⁵ = 3921516569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3921516671) 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, 1418430 + ... + 1421191.

It is an arithmetic number, because the mean of its divisors is an integer number (981089401).

Almost surely, 2^3921516601 is an apocalyptic number.

It is an amenable number.

3921516601 is a deficient number, since it is larger than the sum of its proper divisors (2841003).

3921516601 is a wasteful number, since it uses less digits than its factorization.

3921516601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2841002.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 3921516601 is about 62622.0137092381. The cubic root of 3921516601 is about 1576.9503479106.

Adding to 3921516601 its reverse (1066151293), we get a palindrome (4987667894).

The spelling of 3921516601 in words is "three billion, nine hundred twenty-one million, five hundred sixteen thousand, six hundred one".