189548778389 has 2 divisors, whose sum is σ = 189548778390. Its totient is φ = 189548778388.

The previous prime is 189548778347. The next prime is 189548778407. The reversal of 189548778389 is 983877845981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 188087016100 + 1461762289 = 433690^2 + 38233^2 .

It is an emirp because it is prime and its reverse (983877845981) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 189548778389 - 2¹² = 189548774293 is a prime.

It is a super-3 number, since 3×189548778389³ (a number of 35 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189548778989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94774389194 + 94774389195.

It is an arithmetic number, because the mean of its divisors is an integer number (94774389195).

Almost surely, 2^189548778389 is an apocalyptic number.

It is an amenable number.

189548778389 is a deficient number, since it is larger than the sum of its proper divisors (1).

189548778389 is an equidigital number, since it uses as much as digits as its factorization.

189548778389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 975421440, while the sum is 77.

The spelling of 189548778389 in words is "one hundred eighty-nine billion, five hundred forty-eight million, seven hundred seventy-eight thousand, three hundred eighty-nine".