691047148171 has 2 divisors, whose sum is σ = 691047148172. Its totient is φ = 691047148170.

The previous prime is 691047148133. The next prime is 691047148189. The reversal of 691047148171 is 171841740196.

691047148171 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 not a de Polignac number, because 691047148171 - 2¹¹ = 691047146123 is a prime.

It is not a weakly prime, because it can be changed into another prime (691047140171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345523574085 + 345523574086.

It is an arithmetic number, because the mean of its divisors is an integer number (345523574086).

Almost surely, 2^691047148171 is an apocalyptic number.

691047148171 is a deficient number, since it is larger than the sum of its proper divisors (1).

691047148171 is an equidigital number, since it uses as much as digits as its factorization.

691047148171 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 338688, while the sum is 49.

The spelling of 691047148171 in words is "six hundred ninety-one billion, forty-seven million, one hundred forty-eight thousand, one hundred seventy-one".