116821687 has 2 divisors, whose sum is σ = 116821688. Its totient is φ = 116821686.

The previous prime is 116821651. The next prime is 116821717. The reversal of 116821687 is 786128611.

It is a strong prime.

It is an emirp because it is prime and its reverse (786128611) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 116821687 - 2⁷ = 116821559 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (116821087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58410843 + 58410844.

It is an arithmetic number, because the mean of its divisors is an integer number (58410844).

Almost surely, 2^116821687 is an apocalyptic number.

116821687 is a deficient number, since it is larger than the sum of its proper divisors (1).

116821687 is an equidigital number, since it uses as much as digits as its factorization.

116821687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32256, while the sum is 40.

The square root of 116821687 is about 10808.4081621671. The cubic root of 116821687 is about 488.8487299103.

The spelling of 116821687 in words is "one hundred sixteen million, eight hundred twenty-one thousand, six hundred eighty-seven".