1687212011 has 4 divisors (see below), whose sum is σ = 1700091624. Its totient is φ = 1674332400.

The previous prime is 1687212001. The next prime is 1687212029. The reversal of 1687212011 is 1102127861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1102127861 = 29 ⋅38004409.

It is a cyclic number.

It is not a de Polignac number, because 1687212011 - 2⁶ = 1687211947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1687212001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6439610 + ... + 6439871.

It is an arithmetic number, because the mean of its divisors is an integer number (425022906).

Almost surely, 2^1687212011 is an apocalyptic number.

1687212011 is a deficient number, since it is larger than the sum of its proper divisors (12879613).

1687212011 is a wasteful number, since it uses less digits than its factorization.

1687212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12879612.

The product of its (nonzero) digits is 1344, while the sum is 29.

The square root of 1687212011 is about 41075.6863728411. The cubic root of 1687212011 is about 1190.4830585984.

Adding to 1687212011 its reverse (1102127861), we get a palindrome (2789339872).

The spelling of 1687212011 in words is "one billion, six hundred eighty-seven million, two hundred twelve thousand, eleven".