189511247 has 2 divisors, whose sum is σ = 189511248. Its totient is φ = 189511246.

The previous prime is 189511241. The next prime is 189511253. The reversal of 189511247 is 742115981.

It is a balanced prime because it is at equal distance from previous prime (189511241) and next prime (189511253).

It is an emirp because it is prime and its reverse (742115981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189511247 - 2²⁴ = 172734031 is a prime.

It is a pancake number, because a pancake can be divided into 189511247 parts by 19468 straight cuts.

It is a self number, because there is not a number n which added to its sum of digits gives 189511247.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189511241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94755623 + 94755624.

It is an arithmetic number, because the mean of its divisors is an integer number (94755624).

Almost surely, 2^189511247 is an apocalyptic number.

189511247 is a deficient number, since it is larger than the sum of its proper divisors (1).

189511247 is an equidigital number, since it uses as much as digits as its factorization.

189511247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 38.

The square root of 189511247 is about 13766.3084013108. The cubic root of 189511247 is about 574.3963388717.

The spelling of 189511247 in words is "one hundred eighty-nine million, five hundred eleven thousand, two hundred forty-seven".