553660391 has 2 divisors, whose sum is σ = 553660392. Its totient is φ = 553660390.

The previous prime is 553660363. The next prime is 553660411. The reversal of 553660391 is 193066355.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 553660391 - 2¹⁸ = 553398247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553660321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276830195 + 276830196.

It is an arithmetic number, because the mean of its divisors is an integer number (276830196).

Almost surely, 2^553660391 is an apocalyptic number.

553660391 is a deficient number, since it is larger than the sum of its proper divisors (1).

553660391 is an equidigital number, since it uses as much as digits as its factorization.

553660391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72900, while the sum is 38.

The square root of 553660391 is about 23529.9891840179. The cubic root of 553660391 is about 821.1348509504.

The spelling of 553660391 in words is "five hundred fifty-three million, six hundred sixty thousand, three hundred ninety-one".