1999162987 has 2 divisors, whose sum is σ = 1999162988. Its totient is φ = 1999162986.

The previous prime is 1999162933. The next prime is 1999163011. The reversal of 1999162987 is 7892619991.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1999162987 - 2⁷ = 1999162859 is a prime.

It is not a weakly prime, because it can be changed into another prime (1949162987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999581493 + 999581494.

It is an arithmetic number, because the mean of its divisors is an integer number (999581494).

Almost surely, 2^1999162987 is an apocalyptic number.

1999162987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999162987 is an equidigital number, since it uses as much as digits as its factorization.

1999162987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4408992, while the sum is 61.

The square root of 1999162987 is about 44712.0004808552. Note that the first 3 decimals coincide. The cubic root of 1999162987 is about 1259.7452636537.

The spelling of 1999162987 in words is "one billion, nine hundred ninety-nine million, one hundred sixty-two thousand, nine hundred eighty-seven".