171113531 has 4 divisors (see below), whose sum is σ = 171271464. Its totient is φ = 170955600.

The previous prime is 171113497. The next prime is 171113557. The reversal of 171113531 is 135311171.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135311171 = 307 ⋅440753.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-171113531 is a prime.

It is a super-2 number, since 2×171113531² = 58559680982575922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 171113497 and 171113506.

It is not an unprimeable number, because it can be changed into a prime (171113581) 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, 77330 + ... + 79511.

It is an arithmetic number, because the mean of its divisors is an integer number (42817866).

Almost surely, 2^171113531 is an apocalyptic number.

171113531 is a deficient number, since it is larger than the sum of its proper divisors (157933).

171113531 is a wasteful number, since it uses less digits than its factorization.

171113531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157932.

The product of its digits is 315, while the sum is 23.

The square root of 171113531 is about 13081.0370766236. The cubic root of 171113531 is about 555.1727200976.

The spelling of 171113531 in words is "one hundred seventy-one million, one hundred thirteen thousand, five hundred thirty-one".