1388801275261 has 4 divisors (see below), whose sum is σ = 1388847526272. Its totient is φ = 1388755024252.

The previous prime is 1388801275231. The next prime is 1388801275273. The reversal of 1388801275261 is 1625721088831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1388801275261 - 2²³ = 1388792886653 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1388801275199 and 1388801275208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1388801275231) 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, 23080435 + ... + 23140528.

It is an arithmetic number, because the mean of its divisors is an integer number (347211881568).

Almost surely, 2^{1388801275261} is an apocalyptic number.

It is an amenable number.

1388801275261 is a deficient number, since it is larger than the sum of its proper divisors (46251011).

1388801275261 is an equidigital number, since it uses as much as digits as its factorization.

1388801275261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46251010.

The product of its (nonzero) digits is 1290240, while the sum is 52.

It can be divided in two parts, 138880 and 1275261, that added together give a palindrome (1414141).

The spelling of 1388801275261 in words is "one trillion, three hundred eighty-eight billion, eight hundred one million, two hundred seventy-five thousand, two hundred sixty-one".