171861890143 has 4 divisors (see below), whose sum is σ = 172330179040. Its totient is φ = 171393601248.

The previous prime is 171861890107. The next prime is 171861890147. The reversal of 171861890143 is 341098168171.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 171861890143 - 2¹⁷ = 171861759071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (171861890147) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234143898 + ... + 234144631.

It is an arithmetic number, because the mean of its divisors is an integer number (43082544760).

Almost surely, 2^171861890143 is an apocalyptic number.

171861890143 is a deficient number, since it is larger than the sum of its proper divisors (468288897).

171861890143 is an equidigital number, since it uses as much as digits as its factorization.

171861890143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468288896.

The product of its (nonzero) digits is 290304, while the sum is 49.

The spelling of 171861890143 in words is "one hundred seventy-one billion, eight hundred sixty-one million, eight hundred ninety thousand, one hundred forty-three".