1381246553 has 4 divisors (see below), whose sum is σ = 1453943760. Its totient is φ = 1308549348.

The previous prime is 1381246547. The next prime is 1381246561. The reversal of 1381246553 is 3556421831.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3556421831 = 269 ⋅13220899.

It is a cyclic number.

It is not a de Polignac number, because 1381246553 - 2²² = 1377052249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381246513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36348575 + ... + 36348612.

It is an arithmetic number, because the mean of its divisors is an integer number (363485940).

Almost surely, 2^1381246553 is an apocalyptic number.

It is an amenable number.

1381246553 is a deficient number, since it is larger than the sum of its proper divisors (72697207).

1381246553 is an equidigital number, since it uses as much as digits as its factorization.

1381246553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72697206.

The product of its digits is 86400, while the sum is 38.

The square root of 1381246553 is about 37165.1254942049. The cubic root of 1381246553 is about 1113.6714059208.

The spelling of 1381246553 in words is "one billion, three hundred eighty-one million, two hundred forty-six thousand, five hundred fifty-three".