3818561987 has 2 divisors, whose sum is σ = 3818561988. Its totient is φ = 3818561986.

The previous prime is 3818561983. The next prime is 3818562079. The reversal of 3818561987 is 7891658183.

3818561987 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 is a cyclic number.

It is not a de Polignac number, because 3818561987 - 2² = 3818561983 is a prime.

It is a super-2 number, since 2×3818561987² = 29162831297122776338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3818561983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1909280993 + 1909280994.

It is an arithmetic number, because the mean of its divisors is an integer number (1909280994).

Almost surely, 2^3818561987 is an apocalyptic number.

3818561987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3818561987 is an equidigital number, since it uses as much as digits as its factorization.

3818561987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2903040, while the sum is 56.

The square root of 3818561987 is about 61794.5142144511. The cubic root of 3818561987 is about 1563.0274851977.

The spelling of 3818561987 in words is "three billion, eight hundred eighteen million, five hundred sixty-one thousand, nine hundred eighty-seven".