1681986707 has 2 divisors, whose sum is σ = 1681986708. Its totient is φ = 1681986706.

The previous prime is 1681986679. The next prime is 1681986721. The reversal of 1681986707 is 7076891861.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1681986707 - 2¹⁸ = 1681724563 is a prime.

It is not a weakly prime, because it can be changed into another prime (1681986727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 840993353 + 840993354.

It is an arithmetic number, because the mean of its divisors is an integer number (840993354).

Almost surely, 2^1681986707 is an apocalyptic number.

1681986707 is a deficient number, since it is larger than the sum of its proper divisors (1).

1681986707 is an equidigital number, since it uses as much as digits as its factorization.

1681986707 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1016064, while the sum is 53.

The square root of 1681986707 is about 41012.0312469402. The cubic root of 1681986707 is about 1189.2528103744.

The spelling of 1681986707 in words is "one billion, six hundred eighty-one million, nine hundred eighty-six thousand, seven hundred seven".