1989812064241 has 4 divisors (see below), whose sum is σ = 1992859250292. Its totient is φ = 1986764878192.

The previous prime is 1989812064221. The next prime is 1989812064311. The reversal of 1989812064241 is 1424602189891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 273722544225 + 1716089520016 = 523185^2 + 1309996^2 .

It is a cyclic number.

It is not a de Polignac number, because 1989812064241 - 2¹¹ = 1989812062193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1989812064221) 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, 1523592046 + ... + 1523593351.

It is an arithmetic number, because the mean of its divisors is an integer number (498214812573).

Almost surely, 2^{1989812064241} is an apocalyptic number.

It is an amenable number.

1989812064241 is a deficient number, since it is larger than the sum of its proper divisors (3047186051).

1989812064241 is an equidigital number, since it uses as much as digits as its factorization.

1989812064241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047186050.

The product of its (nonzero) digits is 1990656, while the sum is 55.

The spelling of 1989812064241 in words is "one trillion, nine hundred eighty-nine billion, eight hundred twelve million, sixty-four thousand, two hundred forty-one".