1381278377 has 4 divisors (see below), whose sum is σ = 1425835776. Its totient is φ = 1336720980.

The previous prime is 1381278341. The next prime is 1381278391. The reversal of 1381278377 is 7738721831.

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 1381278377 - 2¹⁴ = 1381261993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1381271377) 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, 22278653 + ... + 22278714.

It is an arithmetic number, because the mean of its divisors is an integer number (356458944).

Almost surely, 2^1381278377 is an apocalyptic number.

It is an amenable number.

1381278377 is a deficient number, since it is larger than the sum of its proper divisors (44557399).

1381278377 is an equidigital number, since it uses as much as digits as its factorization.

1381278377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44557398.

The product of its digits is 395136, while the sum is 47.

The square root of 1381278377 is about 37165.5536350530. The cubic root of 1381278377 is about 1113.6799588728.

The spelling of 1381278377 in words is "one billion, three hundred eighty-one million, two hundred seventy-eight thousand, three hundred seventy-seven".