1988164987 has 2 divisors, whose sum is σ = 1988164988. Its totient is φ = 1988164986.

The previous prime is 1988164903. The next prime is 1988164999. The reversal of 1988164987 is 7894618891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1988164987 - 2²⁷ = 1853947259 is a prime.

It is not a weakly prime, because it can be changed into another prime (1988165987) 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, 994082493 + 994082494.

It is an arithmetic number, because the mean of its divisors is an integer number (994082494).

Almost surely, 2^1988164987 is an apocalyptic number.

1988164987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988164987 is an equidigital number, since it uses as much as digits as its factorization.

1988164987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 61.

The square root of 1988164987 is about 44588.8437504271. The cubic root of 1988164987 is about 1257.4309346583.

The spelling of 1988164987 in words is "one billion, nine hundred eighty-eight million, one hundred sixty-four thousand, nine hundred eighty-seven".