1687996931 has 2 divisors, whose sum is σ = 1687996932. Its totient is φ = 1687996930.

The previous prime is 1687996927. The next prime is 1687996951. The reversal of 1687996931 is 1396997861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1687996931 - 2² = 1687996927 is a prime.

It is a super-2 number, since 2×1687996931² = 5698667278130837522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1687996951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 843998465 + 843998466.

It is an arithmetic number, because the mean of its divisors is an integer number (843998466).

Almost surely, 2^1687996931 is an apocalyptic number.

1687996931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1687996931 is an equidigital number, since it uses as much as digits as its factorization.

1687996931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4408992, while the sum is 59.

The square root of 1687996931 is about 41085.2398191857. The cubic root of 1687996931 is about 1190.6676410316.

The spelling of 1687996931 in words is "one billion, six hundred eighty-seven million, nine hundred ninety-six thousand, nine hundred thirty-one".