1687220963 has 2 divisors, whose sum is σ = 1687220964. Its totient is φ = 1687220962.

The previous prime is 1687220939. The next prime is 1687220989. The reversal of 1687220963 is 3690227861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1687220963 - 2⁸ = 1687220707 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1687220923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843610481 + 843610482.

It is an arithmetic number, because the mean of its divisors is an integer number (843610482).

Almost surely, 2^1687220963 is an apocalyptic number.

1687220963 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687220963 is an equidigital number, since it uses as much as digits as its factorization.

1687220963 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 1687220963 is about 41075.7953422694. The cubic root of 1687220963 is about 1190.4851640808.

The spelling of 1687220963 in words is "one billion, six hundred eighty-seven million, two hundred twenty thousand, nine hundred sixty-three".