3198737681 has 2 divisors, whose sum is σ = 3198737682. Its totient is φ = 3198737680.

The previous prime is 3198737677. The next prime is 3198737693. The reversal of 3198737681 is 1867378913.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2117380225 + 1081357456 = 46015^2 + 32884^2 .

It is a cyclic number.

It is not a de Polignac number, because 3198737681 - 2² = 3198737677 is a prime.

It is a super-2 number, since 2×3198737681² = 20463845503698515522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3198737881) 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, 1599368840 + 1599368841.

It is an arithmetic number, because the mean of its divisors is an integer number (1599368841).

Almost surely, 2^3198737681 is an apocalyptic number.

It is an amenable number.

3198737681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3198737681 is an equidigital number, since it uses as much as digits as its factorization.

3198737681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1524096, while the sum is 53.

The square root of 3198737681 is about 56557.3839653144. The cubic root of 3198737681 is about 1473.4188063485.

The spelling of 3198737681 in words is "three billion, one hundred ninety-eight million, seven hundred thirty-seven thousand, six hundred eighty-one".