1986931717 has 2 divisors, whose sum is σ = 1986931718. Its totient is φ = 1986931716.

The previous prime is 1986931693. The next prime is 1986931753. The reversal of 1986931717 is 7171396891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1728397476 + 258534241 = 41574^2 + 16079^2 .

It is an emirp because it is prime and its reverse (7171396891) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1986931717 - 2¹¹ = 1986929669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1986937717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993465858 + 993465859.

It is an arithmetic number, because the mean of its divisors is an integer number (993465859).

Almost surely, 2^1986931717 is an apocalyptic number.

It is an amenable number.

1986931717 is a deficient number, since it is larger than the sum of its proper divisors (1).

1986931717 is an equidigital number, since it uses as much as digits as its factorization.

1986931717 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 571536, while the sum is 52.

The square root of 1986931717 is about 44575.0122490168. The cubic root of 1986931717 is about 1257.1708837041.

The spelling of 1986931717 in words is "one billion, nine hundred eighty-six million, nine hundred thirty-one thousand, seven hundred seventeen".