1381277249 has 16 divisors (see below), whose sum is σ = 1547864640. Its totient is φ = 1221696000.

The previous prime is 1381277237. The next prime is 1381277263. The reversal of 1381277249 is 9427721831.

It is a cyclic number.

It is not a de Polignac number, because 1381277249 - 2²⁰ = 1380228673 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1381277269) 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 15 ways as a sum of consecutive naturals, for example, 166889 + ... + 174969.

It is an arithmetic number, because the mean of its divisors is an integer number (96741540).

Almost surely, 2^1381277249 is an apocalyptic number.

It is an amenable number.

1381277249 is a deficient number, since it is larger than the sum of its proper divisors (166587391).

1381277249 is a wasteful number, since it uses less digits than its factorization.

1381277249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8512.

The product of its digits is 169344, while the sum is 44.

The square root of 1381277249 is about 37165.5384597075. The cubic root of 1381277249 is about 1113.6796557161.

The spelling of 1381277249 in words is "one billion, three hundred eighty-one million, two hundred seventy-seven thousand, two hundred forty-nine".