3438520681 has 2 divisors, whose sum is σ = 3438520682. Its totient is φ = 3438520680.

The previous prime is 3438520663. The next prime is 3438520693. The reversal of 3438520681 is 1860258343.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3081915225 + 356605456 = 55515^2 + 18884^2 .

It is a cyclic number.

It is not a de Polignac number, because 3438520681 - 2¹⁷ = 3438389609 is a prime.

It is a super-2 number, since 2×3438520681² = 23646848947329407522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3438520621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1719260340 + 1719260341.

It is an arithmetic number, because the mean of its divisors is an integer number (1719260341).

Almost surely, 2^3438520681 is an apocalyptic number.

It is an amenable number.

3438520681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3438520681 is an equidigital number, since it uses as much as digits as its factorization.

3438520681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 138240, while the sum is 40.

The square root of 3438520681 is about 58638.9007485645. The cubic root of 3438520681 is about 1509.3520429453.

The spelling of 3438520681 in words is "three billion, four hundred thirty-eight million, five hundred twenty thousand, six hundred eighty-one".