1686460991 has 2 divisors, whose sum is σ = 1686460992. Its totient is φ = 1686460990.

The previous prime is 1686460987. The next prime is 1686461009. The reversal of 1686460991 is 1990646861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1686460991 - 2² = 1686460987 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1686460591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843230495 + 843230496.

It is an arithmetic number, because the mean of its divisors is an integer number (843230496).

Almost surely, 2^1686460991 is an apocalyptic number.

1686460991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1686460991 is an equidigital number, since it uses as much as digits as its factorization.

1686460991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 559872, while the sum is 50.

The square root of 1686460991 is about 41066.5434508433. The cubic root of 1686460991 is about 1190.3063945174.

The spelling of 1686460991 in words is "one billion, six hundred eighty-six million, four hundred sixty thousand, nine hundred ninety-one".