3705512821 has 2 divisors, whose sum is σ = 3705512822. Its totient is φ = 3705512820.

The previous prime is 3705512807. The next prime is 3705512849. The reversal of 3705512821 is 1282155073.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3014559025 + 690953796 = 54905^2 + 26286^2 .

It is a cyclic number.

It is not a de Polignac number, because 3705512821 - 2¹³ = 3705504629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3705510821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1852756410 + 1852756411.

It is an arithmetic number, because the mean of its divisors is an integer number (1852756411).

Almost surely, 2^3705512821 is an apocalyptic number.

It is an amenable number.

3705512821 is a deficient number, since it is larger than the sum of its proper divisors (1).

3705512821 is an equidigital number, since it uses as much as digits as its factorization.

3705512821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 3705512821 is about 60872.9235456948. The cubic root of 3705512821 is about 1547.4481522243.

Adding to 3705512821 its reverse (1282155073), we get a palindrome (4987667894).

The spelling of 3705512821 in words is "three billion, seven hundred five million, five hundred twelve thousand, eight hundred twenty-one".