553385991 has 16 divisors (see below), whose sum is σ = 763993088. Its totient is φ = 355924800.

The previous prime is 553385981. The next prime is 553386011. The reversal of 553385991 is 199583355.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-553385991 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 553385991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (553385941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21795 + ... + 39771.

It is an arithmetic number, because the mean of its divisors is an integer number (47749568).

Almost surely, 2^553385991 is an apocalyptic number.

553385991 is a deficient number, since it is larger than the sum of its proper divisors (210607097).

553385991 is a wasteful number, since it uses less digits than its factorization.

553385991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18342.

The product of its digits is 729000, while the sum is 48.

The square root of 553385991 is about 23524.1576044712. The cubic root of 553385991 is about 820.9991741345. Note that the first 3 decimals are identical.

The spelling of 553385991 in words is "five hundred fifty-three million, three hundred eighty-five thousand, nine hundred ninety-one".