1383855581 has 2 divisors, whose sum is σ = 1383855582. Its totient is φ = 1383855580.

The previous prime is 1383855563. The next prime is 1383855601. The reversal of 1383855581 is 1855583831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1381311556 + 2544025 = 37166^2 + 1595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1383855581 - 2¹⁸ = 1383593437 is a prime.

It is a super-2 number, since 2×1383855581² = 3830112538129695122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1383855511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 691927790 + 691927791.

It is an arithmetic number, because the mean of its divisors is an integer number (691927791).

Almost surely, 2^1383855581 is an apocalyptic number.

It is an amenable number.

1383855581 is a deficient number, since it is larger than the sum of its proper divisors (1).

1383855581 is an equidigital number, since it uses as much as digits as its factorization.

1383855581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 576000, while the sum is 47.

The square root of 1383855581 is about 37200.2094214535. The cubic root of 1383855581 is about 1114.3721672090.

The spelling of 1383855581 in words is "one billion, three hundred eighty-three million, eight hundred fifty-five thousand, five hundred eighty-one".