189321605813 has 2 divisors, whose sum is σ = 189321605814. Its totient is φ = 189321605812.

The previous prime is 189321605723. The next prime is 189321605839. The reversal of 189321605813 is 318506123981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167495384644 + 21826221169 = 409262^2 + 147737^2 .

It is a cyclic number.

It is not a de Polignac number, because 189321605813 - 2¹⁰ = 189321604789 is a prime.

It is a super-2 number, since 2×189321605813² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (189321605413) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 94660802906 + 94660802907.

It is an arithmetic number, because the mean of its divisors is an integer number (94660802907).

Almost surely, 2^189321605813 is an apocalyptic number.

It is an amenable number.

189321605813 is a deficient number, since it is larger than the sum of its proper divisors (1).

189321605813 is an equidigital number, since it uses as much as digits as its factorization.

189321605813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 47.

The spelling of 189321605813 in words is "one hundred eighty-nine billion, three hundred twenty-one million, six hundred five thousand, eight hundred thirteen".