381553481 has 2 divisors, whose sum is σ = 381553482. Its totient is φ = 381553480.

The previous prime is 381553451. The next prime is 381553507. The reversal of 381553481 is 184355183.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 320087881 + 61465600 = 17891^2 + 7840^2 .

It is an emirp because it is prime and its reverse (184355183) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 381553481 - 2¹⁴ = 381537097 is a prime.

It is a super-2 number, since 2×381553481² = 291166117726434722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (381553411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 190776740 + 190776741.

It is an arithmetic number, because the mean of its divisors is an integer number (190776741).

Almost surely, 2^381553481 is an apocalyptic number.

It is an amenable number.

381553481 is a deficient number, since it is larger than the sum of its proper divisors (1).

381553481 is an equidigital number, since it uses as much as digits as its factorization.

381553481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 57600, while the sum is 38.

The square root of 381553481 is about 19533.3939959240. The cubic root of 381553481 is about 725.3013292012.

The spelling of 381553481 in words is "three hundred eighty-one million, five hundred fifty-three thousand, four hundred eighty-one".