553991 has 2 divisors, whose sum is σ = 553992. Its totient is φ = 553990.
The previous prime is 553981. The next prime is 554003. The reversal of 553991 is 199355.
It is a weak prime.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-553991 is a prime.
It is a Chen prime.
It is an Ulam number.
It is a congruent number.
It is not a weakly prime, because it can be changed into another prime (553901) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 276995 + 276996.
It is an arithmetic number, because the mean of its divisors is an integer number (276996).
2553991 is an apocalyptic number.
553991 is a deficient number, since it is larger than the sum of its proper divisors (1).
553991 is an equidigital number, since it uses as much as digits as its factorization.
553991 is an evil number, because the sum of its binary digits is even.
The product of its digits is 6075, while the sum is 32.
The square root of 553991 is about 744.3057167589. The cubic root of 553991 is about 82.1298260722.
The spelling of 553991 in words is "five hundred fifty-three thousand, nine hundred ninety-one".
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