189702784913 has 4 divisors (see below), whose sum is σ = 194329682148. Its totient is φ = 185075887680.

The previous prime is 189702784849. The next prime is 189702784927. The reversal of 189702784913 is 319487207981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 319487207981 = 331 ⋅965218151.

It can be written as a sum of positive squares in 2 ways, for example, as 69649543744 + 120053241169 = 263912^2 + 346487^2 .

It is a cyclic number.

It is not a de Polignac number, because 189702784913 - 2⁶ = 189702784849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (189702784963) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2313448556 + ... + 2313448637.

It is an arithmetic number, because the mean of its divisors is an integer number (48582420537).

Almost surely, 2^189702784913 is an apocalyptic number.

It is an amenable number.

189702784913 is a deficient number, since it is larger than the sum of its proper divisors (4626897235).

189702784913 is an equidigital number, since it uses as much as digits as its factorization.

189702784913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4626897234.

The product of its (nonzero) digits is 6096384, while the sum is 59.

The spelling of 189702784913 in words is "one hundred eighty-nine billion, seven hundred two million, seven hundred eighty-four thousand, nine hundred thirteen".