3320613781 has 2 divisors, whose sum is σ = 3320613782. Its totient is φ = 3320613780.

The previous prime is 3320613749. The next prime is 3320613817. The reversal of 3320613781 is 1873160233.

Together with next prime (3320613817) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3048033681 + 272580100 = 55209^2 + 16510^2 .

It is a cyclic number.

It is not a de Polignac number, because 3320613781 - 2⁵ = 3320613749 is a prime.

It is a super-2 number, since 2×3320613781² = 22052951765134231922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3320613731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660306890 + 1660306891.

It is an arithmetic number, because the mean of its divisors is an integer number (1660306891).

Almost surely, 2^3320613781 is an apocalyptic number.

It is an amenable number.

3320613781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3320613781 is an equidigital number, since it uses as much as digits as its factorization.

3320613781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 3320613781 is about 57624.7670797896. The cubic root of 3320613781 is about 1491.8991115323.

The spelling of 3320613781 in words is "three billion, three hundred twenty million, six hundred thirteen thousand, seven hundred eighty-one".