247105091 has 2 divisors, whose sum is σ = 247105092. Its totient is φ = 247105090.

The previous prime is 247105037. The next prime is 247105093. The reversal of 247105091 is 190501742.

247105091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-247105091 is a prime.

It is a super-2 number, since 2×247105091² = 122121851996236562, which contains 22 as substring.

Together with 247105093, it forms a pair of twin primes.

It is a Chen prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (247105093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123552545 + 123552546.

It is an arithmetic number, because the mean of its divisors is an integer number (123552546).

Almost surely, 2^247105091 is an apocalyptic number.

247105091 is a deficient number, since it is larger than the sum of its proper divisors (1).

247105091 is an equidigital number, since it uses as much as digits as its factorization.

247105091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2520, while the sum is 29.

The square root of 247105091 is about 15719.5766800509. The cubic root of 247105091 is about 627.5195073379.

The spelling of 247105091 in words is "two hundred forty-seven million, one hundred five thousand, ninety-one".