172207871 has 4 divisors (see below), whose sum is σ = 187863144. Its totient is φ = 156552600.

The previous prime is 172207817. The next prime is 172207897. The reversal of 172207871 is 178702271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 178702271 = 11 ⋅16245661.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172207871 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 (172207171) 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, 7827620 + ... + 7827641.

It is an arithmetic number, because the mean of its divisors is an integer number (46965786).

Almost surely, 2^172207871 is an apocalyptic number.

172207871 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

172207871 is a deficient number, since it is larger than the sum of its proper divisors (15655273).

172207871 is a wasteful number, since it uses less digits than its factorization.

172207871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15655272.

The product of its (nonzero) digits is 10976, while the sum is 35.

The square root of 172207871 is about 13122.7996631816. The cubic root of 172207871 is about 556.3537237707.

The spelling of 172207871 in words is "one hundred seventy-two million, two hundred seven thousand, eight hundred seventy-one".