3506787721 has 2 divisors, whose sum is σ = 3506787722. Its totient is φ = 3506787720.

The previous prime is 3506787629. The next prime is 3506787731. The reversal of 3506787721 is 1277876053.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2281017600 + 1225770121 = 47760^2 + 35011^2 .

It is a cyclic number.

It is not a de Polignac number, because 3506787721 - 2⁷ = 3506787593 is a prime.

It is not a weakly prime, because it can be changed into another prime (3506787731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1753393860 + 1753393861.

It is an arithmetic number, because the mean of its divisors is an integer number (1753393861).

Almost surely, 2^3506787721 is an apocalyptic number.

It is an amenable number.

3506787721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3506787721 is an equidigital number, since it uses as much as digits as its factorization.

3506787721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 493920, while the sum is 46.

The square root of 3506787721 is about 59218.1367572469. The cubic root of 3506787721 is about 1519.2753530217.

The spelling of 3506787721 in words is "three billion, five hundred six million, seven hundred eighty-seven thousand, seven hundred twenty-one".