189172471 has 4 divisors (see below), whose sum is σ = 191836944. Its totient is φ = 186508000.

The previous prime is 189172463. The next prime is 189172499. The reversal of 189172471 is 174271981.

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 189172471 - 2³ = 189172463 is a prime.

It is a super-3 number, since 3×189172471³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (189172271) 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, 1332130 + ... + 1332271.

It is an arithmetic number, because the mean of its divisors is an integer number (47959236).

Almost surely, 2^189172471 is an apocalyptic number.

189172471 is a deficient number, since it is larger than the sum of its proper divisors (2664473).

189172471 is an equidigital number, since it uses as much as digits as its factorization.

189172471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2664472.

The product of its digits is 28224, while the sum is 40.

The square root of 189172471 is about 13753.9983641122. The cubic root of 189172471 is about 574.0538653331.

The spelling of 189172471 in words is "one hundred eighty-nine million, one hundred seventy-two thousand, four hundred seventy-one".