3916071721 has 4 divisors (see below), whose sum is σ = 3963253392. Its totient is φ = 3868890052.

The previous prime is 3916071689. The next prime is 3916071739. The reversal of 3916071721 is 1271706193.

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 3916071721 - 2⁵ = 3916071689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3916071751) 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, 23590711 + ... + 23590876.

It is an arithmetic number, because the mean of its divisors is an integer number (990813348).

Almost surely, 2^3916071721 is an apocalyptic number.

It is an amenable number.

3916071721 is a deficient number, since it is larger than the sum of its proper divisors (47181671).

3916071721 is an equidigital number, since it uses as much as digits as its factorization.

3916071721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47181670.

The product of its (nonzero) digits is 15876, while the sum is 37.

The square root of 3916071721 is about 62578.5244392995. The cubic root of 3916071721 is about 1576.2201642194.

The spelling of 3916071721 in words is "three billion, nine hundred sixteen million, seventy-one thousand, seven hundred twenty-one".