3619983781 has 2 divisors, whose sum is σ = 3619983782. Its totient is φ = 3619983780.

The previous prime is 3619983779. The next prime is 3619983877. The reversal of 3619983781 is 1873899163.

3619983781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3098592225 + 521391556 = 55665^2 + 22834^2 .

It is a cyclic number.

It is not a de Polignac number, because 3619983781 - 2¹ = 3619983779 is a prime.

It is a super-2 number, since 2×3619983781² = 26208565149406111922, which contains 22 as substring.

Together with 3619983779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3619983701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1809991890 + 1809991891.

It is an arithmetic number, because the mean of its divisors is an integer number (1809991891).

Almost surely, 2^3619983781 is an apocalyptic number.

It is an amenable number.

3619983781 is a deficient number, since it is larger than the sum of its proper divisors (1).

3619983781 is an equidigital number, since it uses as much as digits as its factorization.

3619983781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 55.

The square root of 3619983781 is about 60166.3010413637. The cubic root of 3619983781 is about 1535.4495149948.

The spelling of 3619983781 in words is "three billion, six hundred nineteen million, nine hundred eighty-three thousand, seven hundred eighty-one".