189009401228761 has 3 divisors (see below), whose sum is σ = 189009414976831. Its totient is φ = 189009387480692.

The previous prime is 189009401228723. The next prime is 189009401228827. The reversal of 189009401228761 is 167822104900981.

The square root of 189009401228761 is 13748069.

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.

It can be written as a sum of positive squares in only one way, i.e., 172039450537161 + 16969950691600 = 13116381^2 + 4119460^2 .

It is not a de Polignac number, because 189009401228761 - 2⁷ = 189009401228633 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 189009401228696 and 189009401228705.

It is not an unprimeable number, because it can be changed into a prime (189009401288761) 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, 6874035 + ... + 20622103.

Almost surely, 2^{189009401228761} is an apocalyptic number.

189009401228761 is the 13748069-th square number.

189009401228761 is the 6874035-th centered octagonal number.

It is an amenable number.

189009401228761 is a deficient number, since it is larger than the sum of its proper divisors (13748070).

189009401228761 is an frugal number, since it uses more digits than its factorization.

189009401228761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27496138 (or 13748069 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 58.

The spelling of 189009401228761 in words is "one hundred eighty-nine trillion, nine billion, four hundred one million, two hundred twenty-eight thousand, seven hundred sixty-one".