1553281 has 2 divisors, whose sum is σ = 1553282. Its totient is φ = 1553280.

The previous prime is 1553249. The next prime is 1553287. The reversal of 1553281 is 1823551.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1175056 + 378225 = 1084^2 + 615^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553281 - 2⁵ = 1553249 is a prime.

It is a super-2 number, since 2×1553281² = 4825363729922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1553287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776640 + 776641.

It is an arithmetic number, because the mean of its divisors is an integer number (776641).

2^1553281 is an apocalyptic number.

It is an amenable number.

1553281 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553281 is an equidigital number, since it uses as much as digits as its factorization.

1553281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1200, while the sum is 25.

The square root of 1553281 is about 1246.3069445365. The cubic root of 1553281 is about 115.8110528833.

The spelling of 1553281 in words is "one million, five hundred fifty-three thousand, two hundred eighty-one".