553561391 has 2 divisors, whose sum is σ = 553561392. Its totient is φ = 553561390.

The previous prime is 553561387. The next prime is 553561417. The reversal of 553561391 is 193165355.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 553561391 - 2² = 553561387 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (553561321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276780695 + 276780696.

It is an arithmetic number, because the mean of its divisors is an integer number (276780696).

Almost surely, 2^553561391 is an apocalyptic number.

553561391 is a deficient number, since it is larger than the sum of its proper divisors (1).

553561391 is an equidigital number, since it uses as much as digits as its factorization.

553561391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60750, while the sum is 38.

The square root of 553561391 is about 23527.8853915944. The cubic root of 553561391 is about 821.0859056660.

The spelling of 553561391 in words is "five hundred fifty-three million, five hundred sixty-one thousand, three hundred ninety-one".