1553691553 has 2 divisors, whose sum is σ = 1553691554. Its totient is φ = 1553691552.

The previous prime is 1553691551. The next prime is 1553691599. The reversal of 1553691553 is 3551963551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1224160144 + 329531409 = 34988^2 + 18153^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553691553 - 2¹ = 1553691551 is a prime.

Together with 1553691551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1553691551) 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, 776845776 + 776845777.

It is an arithmetic number, because the mean of its divisors is an integer number (776845777).

Almost surely, 2^1553691553 is an apocalyptic number.

It is an amenable number.

1553691553 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553691553 is an equidigital number, since it uses as much as digits as its factorization.

1553691553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 303750, while the sum is 43.

The square root of 1553691553 is about 39416.8942586805. The cubic root of 1553691553 is about 1158.2125545595.

The spelling of 1553691553 in words is "one billion, five hundred fifty-three million, six hundred ninety-one thousand, five hundred fifty-three".