3204961681 has 2 divisors, whose sum is σ = 3204961682. Its totient is φ = 3204961680.

The previous prime is 3204961679. The next prime is 3204961693. The reversal of 3204961681 is 1861694023.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2538547456 + 666414225 = 50384^2 + 25815^2 .

It is a cyclic number.

It is not a de Polignac number, because 3204961681 - 2¹ = 3204961679 is a prime.

It is a super-2 number, since 2×3204961681² = 20543558753356691522, which contains 22 as substring.

Together with 3204961679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3202961681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1602480840 + 1602480841.

It is an arithmetic number, because the mean of its divisors is an integer number (1602480841).

Almost surely, 2^3204961681 is an apocalyptic number.

It is an amenable number.

3204961681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3204961681 is an equidigital number, since it uses as much as digits as its factorization.

3204961681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 3204961681 is about 56612.3809868477. The cubic root of 3204961681 is about 1474.3738307009.

The spelling of 3204961681 in words is "three billion, two hundred four million, nine hundred sixty-one thousand, six hundred eighty-one".