1388228289361 has 3 divisors (see below), whose sum is σ = 1388229467593. Its totient is φ = 1388227111130.

The previous prime is 1388228289299. The next prime is 1388228289397. The reversal of 1388228289361 is 1639828228831.

The square root of 1388228289361 is 1178231.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a de Polignac number, because none of the positive numbers 2^k-1388228289361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1388228289361.

It is not an unprimeable number, because it can be changed into a prime (1388228283361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 589116 + ... + 1767346.

Almost surely, 2^{1388228289361} is an apocalyptic number.

1388228289361 is the 1178231-st square number.

1388228289361 is the 589116-th centered octagonal number.

It is an amenable number.

1388228289361 is a deficient number, since it is larger than the sum of its proper divisors (1178232).

1388228289361 is an frugal number, since it uses more digits than its factorization.

1388228289361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2356462 (or 1178231 counting only the distinct ones).

The product of its digits is 15925248, while the sum is 61.

The spelling of 1388228289361 in words is "one trillion, three hundred eighty-eight billion, two hundred twenty-eight million, two hundred eighty-nine thousand, three hundred sixty-one".