171077891 has 2 divisors, whose sum is σ = 171077892. Its totient is φ = 171077890.

The previous prime is 171077839. The next prime is 171077903. The reversal of 171077891 is 198770171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171077891 - 2⁶ = 171077827 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (171077801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85538945 + 85538946.

It is an arithmetic number, because the mean of its divisors is an integer number (85538946).

Almost surely, 2^171077891 is an apocalyptic number.

171077891 is a deficient number, since it is larger than the sum of its proper divisors (1).

171077891 is an equidigital number, since it uses as much as digits as its factorization.

171077891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24696, while the sum is 41.

The square root of 171077891 is about 13079.6747283715. The cubic root of 171077891 is about 555.1341731175.

The spelling of 171077891 in words is "one hundred seventy-one million, seventy-seven thousand, eight hundred ninety-one".