189172801 has 2 divisors, whose sum is σ = 189172802. Its totient is φ = 189172800.

The previous prime is 189172799. The next prime is 189172807. The reversal of 189172801 is 108271981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 142181776 + 46991025 = 11924^2 + 6855^2 .

It is a cyclic number.

It is not a de Polignac number, because 189172801 - 2¹ = 189172799 is a prime.

Together with 189172799, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (189172807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94586400 + 94586401.

It is an arithmetic number, because the mean of its divisors is an integer number (94586401).

Almost surely, 2^189172801 is an apocalyptic number.

It is an amenable number.

189172801 is a deficient number, since it is larger than the sum of its proper divisors (1).

189172801 is an equidigital number, since it uses as much as digits as its factorization.

189172801 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 37.

The square root of 189172801 is about 13754.0103606185. The cubic root of 189172801 is about 574.0541991338.

The spelling of 189172801 in words is "one hundred eighty-nine million, one hundred seventy-two thousand, eight hundred one".