1990518487 has 2 divisors, whose sum is σ = 1990518488. Its totient is φ = 1990518486.

The previous prime is 1990518469. The next prime is 1990518529. The reversal of 1990518487 is 7848150991.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990518487 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1990518427) 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, 995259243 + 995259244.

It is an arithmetic number, because the mean of its divisors is an integer number (995259244).

Almost surely, 2^1990518487 is an apocalyptic number.

1990518487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1990518487 is an equidigital number, since it uses as much as digits as its factorization.

1990518487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 725760, while the sum is 52.

The square root of 1990518487 is about 44615.2270755176. The cubic root of 1990518487 is about 1257.9269023422.

The spelling of 1990518487 in words is "one billion, nine hundred ninety million, five hundred eighteen thousand, four hundred eighty-seven".