6361021987 has 2 divisors, whose sum is σ = 6361021988. Its totient is φ = 6361021986.

The previous prime is 6361021943. The next prime is 6361021991. The reversal of 6361021987 is 7891201636.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6361021987 is a prime.

It is not a weakly prime, because it can be changed into another prime (6361024987) 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, 3180510993 + 3180510994.

It is an arithmetic number, because the mean of its divisors is an integer number (3180510994).

Almost surely, 2^6361021987 is an apocalyptic number.

6361021987 is a deficient number, since it is larger than the sum of its proper divisors (1).

6361021987 is an equidigital number, since it uses as much as digits as its factorization.

6361021987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 6361021987 is about 79756.0153656136. The cubic root of 6361021987 is about 1852.8586908604.

The spelling of 6361021987 in words is "six billion, three hundred sixty-one million, twenty-one thousand, nine hundred eighty-seven".