201501112171 has 4 divisors (see below), whose sum is σ = 202950760600. Its totient is φ = 200051463744.

The previous prime is 201501112151. The next prime is 201501112223. The reversal of 201501112171 is 171211105102.

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 201501112171 - 2⁹ = 201501111659 is a prime.

It is a super-2 number, since 2×201501112171² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (201501112151) 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, 724824006 + ... + 724824283.

It is an arithmetic number, because the mean of its divisors is an integer number (50737690150).

Almost surely, 2^201501112171 is an apocalyptic number.

201501112171 is a deficient number, since it is larger than the sum of its proper divisors (1449648429).

201501112171 is a wasteful number, since it uses less digits than its factorization.

201501112171 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1449648428.

The product of its (nonzero) digits is 140, while the sum is 22.

Adding to 201501112171 its reverse (171211105102), we get a palindrome (372712217273).

The spelling of 201501112171 in words is "two hundred one billion, five hundred one million, one hundred twelve thousand, one hundred seventy-one".