1138881481 has 2 divisors, whose sum is σ = 1138881482. Its totient is φ = 1138881480.

The previous prime is 1138881463. The next prime is 1138881509. The reversal of 1138881481 is 1841888311.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 638017081 + 500864400 = 25259^2 + 22380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138881481 - 2⁵ = 1138881449 is a prime.

It is a super-2 number, since 2×1138881481² = 2594102055529506722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1138881421) 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 as a sum of consecutive naturals, namely, 569440740 + 569440741.

It is an arithmetic number, because the mean of its divisors is an integer number (569440741).

Almost surely, 2^1138881481 is an apocalyptic number.

It is an amenable number.

1138881481 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138881481 is an equidigital number, since it uses as much as digits as its factorization.

1138881481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 49152, while the sum is 43.

The square root of 1138881481 is about 33747.3181304826. The cubic root of 1138881481 is about 1044.3021617830.

The spelling of 1138881481 in words is "one billion, one hundred thirty-eight million, eight hundred eighty-one thousand, four hundred eighty-one".