1389121997101 has 6 divisors (see below), whose sum is σ = 1475641706570. Its totient is φ = 1307408938176.

The previous prime is 1389121997071. The next prime is 1389121997143. The reversal of 1389121997101 is 1017991219831.

It can be written as a sum of positive squares in 3 ways, for example, as 1035692936100 + 353429061001 = 1017690^2 + 594499^2 .

It is not a de Polignac number, because 1389121997101 - 2⁷ = 1389121996973 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389121998101) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2403324966 + ... + 2403325543.

Almost surely, 2^{1389121997101} is an apocalyptic number.

It is an amenable number.

1389121997101 is a deficient number, since it is larger than the sum of its proper divisors (86519709469).

1389121997101 is an equidigital number, since it uses as much as digits as its factorization.

1389121997101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4806650543 (or 4806650526 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 52.

The spelling of 1389121997101 in words is "one trillion, three hundred eighty-nine billion, one hundred twenty-one million, nine hundred ninety-seven thousand, one hundred one".