1381456121 has 4 divisors (see below), whose sum is σ = 1381606500. Its totient is φ = 1381305744.

The previous prime is 1381456003. The next prime is 1381456127. The reversal of 1381456121 is 1216541831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1216541831 = 541 ⋅2248691.

It can be written as a sum of positive squares in 2 ways, for example, as 708624400 + 672831721 = 26620^2 + 25939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1381456121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381456127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60446 + ... + 80103.

It is an arithmetic number, because the mean of its divisors is an integer number (345401625).

Almost surely, 2^1381456121 is an apocalyptic number.

It is an amenable number.

1381456121 is a deficient number, since it is larger than the sum of its proper divisors (150379).

1381456121 is an equidigital number, since it uses as much as digits as its factorization.

1381456121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150378.

The product of its digits is 5760, while the sum is 32.

The square root of 1381456121 is about 37167.9448046297. The cubic root of 1381456121 is about 1113.7277265649.

Adding to 1381456121 its reverse (1216541831), we get a palindrome (2597997952).

The spelling of 1381456121 in words is "one billion, three hundred eighty-one million, four hundred fifty-six thousand, one hundred twenty-one".