1685106887 has 2 divisors, whose sum is σ = 1685106888. Its totient is φ = 1685106886.

The previous prime is 1685106853. The next prime is 1685106953. The reversal of 1685106887 is 7886015861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1685106887 - 2¹⁸ = 1684844743 is a prime.

It is a super-2 number, since 2×1685106887² = 5679170441229661538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1685106287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 842553443 + 842553444.

It is an arithmetic number, because the mean of its divisors is an integer number (842553444).

Almost surely, 2^1685106887 is an apocalyptic number.

1685106887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1685106887 is an equidigital number, since it uses as much as digits as its factorization.

1685106887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 1685106887 is about 41050.0534348008. The cubic root of 1685106887 is about 1189.9877330845.

The spelling of 1685106887 in words is "one billion, six hundred eighty-five million, one hundred six thousand, eight hundred eighty-seven".