116609891 has 2 divisors, whose sum is σ = 116609892. Its totient is φ = 116609890.

The previous prime is 116609887. The next prime is 116609929. The reversal of 116609891 is 198906611.

It is a happy number.

It is a weak prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 168609911 and 119906861.

It is a cyclic number.

It is not a de Polignac number, because 116609891 - 2² = 116609887 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (116609861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58304945 + 58304946.

It is an arithmetic number, because the mean of its divisors is an integer number (58304946).

Almost surely, 2^116609891 is an apocalyptic number.

116609891 is a deficient number, since it is larger than the sum of its proper divisors (1).

116609891 is an equidigital number, since it uses as much as digits as its factorization.

116609891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 116609891 is about 10798.6059748469. The cubic root of 116609891 is about 488.5531260111.

The spelling of 116609891 in words is "one hundred sixteen million, six hundred nine thousand, eight hundred ninety-one".