171861890107 has 2 divisors, whose sum is σ = 171861890108. Its totient is φ = 171861890106.

The previous prime is 171861890051. The next prime is 171861890147. The reversal of 171861890107 is 701098168171.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171861890107 - 2²³ = 171853501499 is a prime.

It is not a weakly prime, because it can be changed into another prime (171861890147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85930945053 + 85930945054.

It is an arithmetic number, because the mean of its divisors is an integer number (85930945054).

Almost surely, 2^171861890107 is an apocalyptic number.

171861890107 is a deficient number, since it is larger than the sum of its proper divisors (1).

171861890107 is an equidigital number, since it uses as much as digits as its factorization.

171861890107 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 49.

The spelling of 171861890107 in words is "one hundred seventy-one billion, eight hundred sixty-one million, eight hundred ninety thousand, one hundred seven".