3391512721 has 2 divisors, whose sum is σ = 3391512722. Its totient is φ = 3391512720.

The previous prime is 3391512703. The next prime is 3391512757. The reversal of 3391512721 is 1272151933.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3191007121 + 200505600 = 56489^2 + 14160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3391512721 is a prime.

It is not a weakly prime, because it can be changed into another prime (3391512791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1695756360 + 1695756361.

It is an arithmetic number, because the mean of its divisors is an integer number (1695756361).

Almost surely, 2^3391512721 is an apocalyptic number.

It is an amenable number.

3391512721 is a deficient number, since it is larger than the sum of its proper divisors (1).

3391512721 is an equidigital number, since it uses as much as digits as its factorization.

3391512721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11340, while the sum is 34.

The square root of 3391512721 is about 58236.6956566047. The cubic root of 3391512721 is about 1502.4423501625.

The spelling of 3391512721 in words is "three billion, three hundred ninety-one million, five hundred twelve thousand, seven hundred twenty-one".