171955431145 has 16 divisors (see below), whose sum is σ = 216851912640. Its totient is φ = 130733676864.

The previous prime is 171955431101. The next prime is 171955431157. The reversal of 171955431145 is 541134559171.

It is a cyclic number.

It is not a de Polignac number, because 171955431145 - 2³⁷ = 34516477673 is a prime.

It is a super-2 number, since 2×171955431145² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 171955431095 and 171955431104.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10800055 + ... + 10815964.

It is an arithmetic number, because the mean of its divisors is an integer number (13553244540).

Almost surely, 2^171955431145 is an apocalyptic number.

It is an amenable number.

171955431145 is a deficient number, since it is larger than the sum of its proper divisors (44896481495).

171955431145 is a wasteful number, since it uses less digits than its factorization.

171955431145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21616104.

The product of its digits is 378000, while the sum is 46.

The spelling of 171955431145 in words is "one hundred seventy-one billion, nine hundred fifty-five million, four hundred thirty-one thousand, one hundred forty-five".