1381256159 has 4 divisors (see below), whose sum is σ = 1384069800. Its totient is φ = 1378442520.

The previous prime is 1381256153. The next prime is 1381256189. The reversal of 1381256159 is 9516521831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9516521831 = 137 ⋅69463663.

It is a cyclic number.

It is not a de Polignac number, because 1381256159 - 2¹⁶ = 1381190623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1381256153) 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, 1406084 + ... + 1407065.

It is an arithmetic number, because the mean of its divisors is an integer number (346017450).

Almost surely, 2^1381256159 is an apocalyptic number.

1381256159 is a deficient number, since it is larger than the sum of its proper divisors (2813641).

1381256159 is an equidigital number, since it uses as much as digits as its factorization.

1381256159 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2813640.

The product of its digits is 64800, while the sum is 41.

The square root of 1381256159 is about 37165.2547280387. The cubic root of 1381256159 is about 1113.6739876232.

The spelling of 1381256159 in words is "one billion, three hundred eighty-one million, two hundred fifty-six thousand, one hundred fifty-nine".