3643651987 has 2 divisors, whose sum is σ = 3643651988. Its totient is φ = 3643651986.

The previous prime is 3643651937. The next prime is 3643652011. The reversal of 3643651987 is 7891563463.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3643651987 - 2¹⁹ = 3643127699 is a prime.

It is not a weakly prime, because it can be changed into another prime (3643651937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1821825993 + 1821825994.

It is an arithmetic number, because the mean of its divisors is an integer number (1821825994).

Almost surely, 2^3643651987 is an apocalyptic number.

3643651987 is a deficient number, since it is larger than the sum of its proper divisors (1).

3643651987 is an equidigital number, since it uses as much as digits as its factorization.

3643651987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3265920, while the sum is 52.

The square root of 3643651987 is about 60362.6704760484. The cubic root of 3643651987 is about 1538.7886109373.

The spelling of 3643651987 in words is "three billion, six hundred forty-three million, six hundred fifty-one thousand, nine hundred eighty-seven".