3616978381 has 2 divisors, whose sum is σ = 3616978382. Its totient is φ = 3616978380.

The previous prime is 3616978363. The next prime is 3616978433. The reversal of 3616978381 is 1838796163.

It is an a-pointer prime, because the next prime (3616978433) can be obtained adding 3616978381 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3188860900 + 428117481 = 56470^2 + 20691^2 .

It is a cyclic number.

It is not a de Polignac number, because 3616978381 - 2⁹ = 3616977869 is a prime.

It is a super-3 number, since 3×3616978381³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3616978331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1808489190 + 1808489191.

It is an arithmetic number, because the mean of its divisors is an integer number (1808489191).

Almost surely, 2^3616978381 is an apocalyptic number.

It is an amenable number.

3616978381 is a deficient number, since it is larger than the sum of its proper divisors (1).

3616978381 is an equidigital number, since it uses as much as digits as its factorization.

3616978381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 52.

The square root of 3616978381 is about 60141.3200802909. The cubic root of 3616978381 is about 1535.0244746351.

The spelling of 3616978381 in words is "three billion, six hundred sixteen million, nine hundred seventy-eight thousand, three hundred eighty-one".