189388263349 has 2 divisors, whose sum is σ = 189388263350. Its totient is φ = 189388263348.

The previous prime is 189388263313. The next prime is 189388263373. The reversal of 189388263349 is 943362883981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 176946422500 + 12441840849 = 420650^2 + 111543^2 .

It is a cyclic number.

It is not a de Polignac number, because 189388263349 - 2¹¹ = 189388261301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189388263749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94694131674 + 94694131675.

It is an arithmetic number, because the mean of its divisors is an integer number (94694131675).

Almost surely, 2^189388263349 is an apocalyptic number.

It is an amenable number.

189388263349 is a deficient number, since it is larger than the sum of its proper divisors (1).

189388263349 is an equidigital number, since it uses as much as digits as its factorization.

189388263349 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53747712, while the sum is 64.

It can be divided in two parts, 1893882 and 63349, that added together give a triangular number (1957231 = T₁₉₇₈).

The spelling of 189388263349 in words is "one hundred eighty-nine billion, three hundred eighty-eight million, two hundred sixty-three thousand, three hundred forty-nine".