1389121997109 has 64 divisors (see below), whose sum is σ = 2394662400000. Its totient is φ = 695033418240.

The previous prime is 1389121997071. The next prime is 1389121997143. The reversal of 1389121997109 is 9017991219831.

It is not a de Polignac number, because 1389121997109 - 2³¹ = 1386974513461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389121997209) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2486392 + ... + 2993390.

It is an arithmetic number, because the mean of its divisors is an integer number (37416600000).

Almost surely, 2^{1389121997109} is an apocalyptic number.

It is an amenable number.

1389121997109 is a deficient number, since it is larger than the sum of its proper divisors (1005540402891).

1389121997109 is a wasteful number, since it uses less digits than its factorization.

1389121997109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 507458.

The product of its (nonzero) digits is 2204496, while the sum is 60.

The spelling of 1389121997109 in words is "one trillion, three hundred eighty-nine billion, one hundred twenty-one million, nine hundred ninety-seven thousand, one hundred nine".