171138516943 has 2 divisors, whose sum is σ = 171138516944. Its totient is φ = 171138516942.

The previous prime is 171138516917. The next prime is 171138516949. The reversal of 171138516943 is 349615831171.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 171138516943 - 2³³ = 162548582351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (171138516949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85569258471 + 85569258472.

It is an arithmetic number, because the mean of its divisors is an integer number (85569258472).

Almost surely, 2^171138516943 is an apocalyptic number.

171138516943 is a deficient number, since it is larger than the sum of its proper divisors (1).

171138516943 is an equidigital number, since it uses as much as digits as its factorization.

171138516943 is an evil number, because the sum of its binary digits is even.

The product of its digits is 544320, while the sum is 49.

The spelling of 171138516943 in words is "one hundred seventy-one billion, one hundred thirty-eight million, five hundred sixteen thousand, nine hundred forty-three".