3916715821 has 2 divisors, whose sum is σ = 3916715822. Its totient is φ = 3916715820.

The previous prime is 3916715809. The next prime is 3916715837. The reversal of 3916715821 is 1285176193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3307860196 + 608855625 = 57514^2 + 24675^2 .

It is a cyclic number.

It is not a de Polignac number, because 3916715821 - 2¹³ = 3916707629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3916715021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1958357910 + 1958357911.

It is an arithmetic number, because the mean of its divisors is an integer number (1958357911).

Almost surely, 2^3916715821 is an apocalyptic number.

It is an amenable number.

3916715821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3916715821 is an equidigital number, since it uses as much as digits as its factorization.

3916715821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 43.

The square root of 3916715821 is about 62583.6705618966. The cubic root of 3916715821 is about 1576.3065763031.

The spelling of 3916715821 in words is "three billion, nine hundred sixteen million, seven hundred fifteen thousand, eight hundred twenty-one".