172101789 has 12 divisors (see below), whose sum is σ = 248913756. Its totient is φ = 114585792.

The previous prime is 172101779. The next prime is 172101793. The reversal of 172101789 is 987101271.

It can be written as a sum of positive squares in 2 ways, for example, as 27092025 + 145009764 = 5205^2 + 12042^2 .

It is not a de Polignac number, because 172101789 - 2⁸ = 172101533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (172101779) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4824 + ... + 19169.

It is an arithmetic number, because the mean of its divisors is an integer number (20742813).

Almost surely, 2^172101789 is an apocalyptic number.

It is an amenable number.

172101789 is a deficient number, since it is larger than the sum of its proper divisors (76811967).

172101789 is a wasteful number, since it uses less digits than its factorization.

172101789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24796 (or 24793 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 36.

The square root of 172101789 is about 13118.7571438761. The cubic root of 172101789 is about 556.2394602388.

The spelling of 172101789 in words is "one hundred seventy-two million, one hundred one thousand, seven hundred eighty-nine".