3684199781 has 2 divisors, whose sum is σ = 3684199782. Its totient is φ = 3684199780.

The previous prime is 3684199751. The next prime is 3684199787. The reversal of 3684199781 is 1879914863.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3512458756 + 171741025 = 59266^2 + 13105^2 .

It is an emirp because it is prime and its reverse (1879914863) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3684199781 - 2¹⁰ = 3684198757 is a prime.

It is a super-2 number, since 2×3684199781² = 27146656052640895922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3684199787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1842099890 + 1842099891.

It is an arithmetic number, because the mean of its divisors is an integer number (1842099891).

Almost surely, 2^3684199781 is an apocalyptic number.

It is an amenable number.

3684199781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3684199781 is an equidigital number, since it uses as much as digits as its factorization.

3684199781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2612736, while the sum is 56.

The square root of 3684199781 is about 60697.6093516046. The cubic root of 3684199781 is about 1544.4756208589.

The spelling of 3684199781 in words is "three billion, six hundred eighty-four million, one hundred ninety-nine thousand, seven hundred eighty-one".