3987686569 has 2 divisors, whose sum is σ = 3987686570. Its totient is φ = 3987686568.

The previous prime is 3987686567. The next prime is 3987686597. The reversal of 3987686569 is 9656867893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3790002969 + 197683600 = 61563^2 + 14060^2 .

It is a cyclic number.

It is not a de Polignac number, because 3987686569 - 2¹ = 3987686567 is a prime.

It is a super-2 number, since 2×3987686569² = 31803288345165983522, which contains 22 as substring.

Together with 3987686567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (3987686561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1993843284 + 1993843285.

It is an arithmetic number, because the mean of its divisors is an integer number (1993843285).

Almost surely, 2^3987686569 is an apocalyptic number.

It is an amenable number.

3987686569 is a deficient number, since it is larger than the sum of its proper divisors (1).

3987686569 is an equidigital number, since it uses as much as digits as its factorization.

3987686569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117573120, while the sum is 67.

The square root of 3987686569 is about 63148.1319517846. The cubic root of 3987686569 is about 1585.7705149195.

The spelling of 3987686569 in words is "three billion, nine hundred eighty-seven million, six hundred eighty-six thousand, five hundred sixty-nine".