1553938549 has 2 divisors, whose sum is σ = 1553938550. Its totient is φ = 1553938548.

The previous prime is 1553938537. The next prime is 1553938609. The reversal of 1553938549 is 9458393551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1215010449 + 338928100 = 34857^2 + 18410^2 .

It is a cyclic number.

It is not a de Polignac number, because 1553938549 - 2⁹ = 1553938037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1553938496 and 1553938505.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1553938049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 776969274 + 776969275.

It is an arithmetic number, because the mean of its divisors is an integer number (776969275).

Almost surely, 2^1553938549 is an apocalyptic number.

It is an amenable number.

1553938549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1553938549 is an equidigital number, since it uses as much as digits as its factorization.

1553938549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2916000, while the sum is 52.

The square root of 1553938549 is about 39420.0272577278. The cubic root of 1553938549 is about 1158.2739263956.

The spelling of 1553938549 in words is "one billion, five hundred fifty-three million, nine hundred thirty-eight thousand, five hundred forty-nine".