189863247289 has 3 divisors (see below), whose sum is σ = 189863683023. Its totient is φ = 189862811556.

The previous prime is 189863247281. The next prime is 189863247307. The reversal of 189863247289 is 982742368981.

The square root of 189863247289 is 435733.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 982742368981 = 149 ⋅6595586369.

It can be written as a sum of positive squares in only one way, i.e., 42950490025 + 146912757264 = 207245^2 + 383292^2 .

It is not a de Polignac number, because 189863247289 - 2³ = 189863247281 is a prime.

It is a super-2 number, since 2×189863247289² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (189863247281) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 217867 + ... + 653599.

It is an arithmetic number, because the mean of its divisors is an integer number (63287894341).

Almost surely, 2^189863247289 is an apocalyptic number.

189863247289 is the 435733-rd square number.

189863247289 is the 217867-th centered octagonal number.

It is an amenable number.

189863247289 is a deficient number, since it is larger than the sum of its proper divisors (435734).

189863247289 is an frugal number, since it uses more digits than its factorization.

189863247289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871466 (or 435733 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 67.

The spelling of 189863247289 in words is "one hundred eighty-nine billion, eight hundred sixty-three million, two hundred forty-seven thousand, two hundred eighty-nine".