171025804091 has 2 divisors, whose sum is σ = 171025804092. Its totient is φ = 171025804090.

The previous prime is 171025804067. The next prime is 171025804097. The reversal of 171025804091 is 190408520171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171025804091 - 2¹⁴ = 171025787707 is a prime.

It is a super-2 number, since 2×171025804091² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (171025804097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85512902045 + 85512902046.

It is an arithmetic number, because the mean of its divisors is an integer number (85512902046).

Almost surely, 2^171025804091 is an apocalyptic number.

171025804091 is a deficient number, since it is larger than the sum of its proper divisors (1).

171025804091 is an equidigital number, since it uses as much as digits as its factorization.

171025804091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 38.

The spelling of 171025804091 in words is "one hundred seventy-one billion, twenty-five million, eight hundred four thousand, ninety-one".