1630081987 has 2 divisors, whose sum is σ = 1630081988. Its totient is φ = 1630081986.

The previous prime is 1630081979. The next prime is 1630081997. The reversal of 1630081987 is 7891800361.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1630081987 - 2³ = 1630081979 is a prime.

It is not a weakly prime, because it can be changed into another prime (1630081997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815040993 + 815040994.

It is an arithmetic number, because the mean of its divisors is an integer number (815040994).

Almost surely, 2^1630081987 is an apocalyptic number.

1630081987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630081987 is an equidigital number, since it uses as much as digits as its factorization.

1630081987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 1630081987 is about 40374.2738262870. The cubic root of 1630081987 is about 1176.8916533066.

The spelling of 1630081987 in words is "one billion, six hundred thirty million, eighty-one thousand, nine hundred eighty-seven".