116821091 has 2 divisors, whose sum is σ = 116821092. Its totient is φ = 116821090.

The previous prime is 116821087. The next prime is 116821109. The reversal of 116821091 is 190128611.

Together with next prime (116821109) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 116821091 - 2² = 116821087 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (116821391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58410545 + 58410546.

It is an arithmetic number, because the mean of its divisors is an integer number (58410546).

Almost surely, 2^116821091 is an apocalyptic number.

116821091 is a deficient number, since it is larger than the sum of its proper divisors (1).

116821091 is an equidigital number, since it uses as much as digits as its factorization.

116821091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 29.

The square root of 116821091 is about 10808.3805910044. The cubic root of 116821091 is about 488.8478985739.

The spelling of 116821091 in words is "one hundred sixteen million, eight hundred twenty-one thousand, ninety-one".