687412111 has 4 divisors (see below), whose sum is σ = 698681224. Its totient is φ = 676143000.

The previous prime is 687412091. The next prime is 687412139. The reversal of 687412111 is 111214786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 687412111 - 2²⁵ = 653857679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687412171) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5634465 + ... + 5634586.

It is an arithmetic number, because the mean of its divisors is an integer number (174670306).

Almost surely, 2^687412111 is an apocalyptic number.

687412111 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

687412111 is a deficient number, since it is larger than the sum of its proper divisors (11269113).

687412111 is a wasteful number, since it uses less digits than its factorization.

687412111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11269112.

The product of its digits is 2688, while the sum is 31.

The square root of 687412111 is about 26218.5451732166. The cubic root of 687412111 is about 882.5494726791.

Adding to 687412111 its reverse (111214786), we get a palindrome (798626897).

The spelling of 687412111 in words is "six hundred eighty-seven million, four hundred twelve thousand, one hundred eleven".