55933993 has 4 divisors (see below), whose sum is σ = 56125188. Its totient is φ = 55742800.

The previous prime is 55933897. The next prime is 55934009. The reversal of 55933993 is 39933955.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 44462224 + 11471769 = 6668^2 + 3387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55933993 is a prime.

It is a super-2 number, since 2×55933993² = 6257223145848098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55933793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95158 + ... + 95743.

It is an arithmetic number, because the mean of its divisors is an integer number (14031297).

Almost surely, 2^55933993 is an apocalyptic number.

It is an amenable number.

55933993 is a deficient number, since it is larger than the sum of its proper divisors (191195).

55933993 is a wasteful number, since it uses less digits than its factorization.

55933993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191194.

The product of its digits is 492075, while the sum is 46.

The square root of 55933993 is about 7478.9031949879. The cubic root of 55933993 is about 382.4358597793.

The spelling of 55933993 in words is "fifty-five million, nine hundred thirty-three thousand, nine hundred ninety-three".