1381884121 has 4 divisors (see below), whose sum is σ = 1395566244. Its totient is φ = 1368202000.

The previous prime is 1381884109. The next prime is 1381884149. The reversal of 1381884121 is 1214881831.

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 1187560521 + 194323600 = 34461^2 + 13940^2 .

It is a cyclic number.

It is not a de Polignac number, because 1381884121 - 2⁹ = 1381883609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381884821) 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, 6840910 + ... + 6841111.

It is an arithmetic number, because the mean of its divisors is an integer number (348891561).

Almost surely, 2^1381884121 is an apocalyptic number.

It is an amenable number.

1381884121 is a deficient number, since it is larger than the sum of its proper divisors (13682123).

1381884121 is a wasteful number, since it uses less digits than its factorization.

1381884121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13682122.

The product of its digits is 12288, while the sum is 37.

The square root of 1381884121 is about 37173.7020082746. The cubic root of 1381884121 is about 1113.8427323284.

It can be divided in two parts, 138188412 and 1, that added together give a cube (138188413 = 517³).

The spelling of 1381884121 in words is "one billion, three hundred eighty-one million, eight hundred eighty-four thousand, one hundred twenty-one".