55991033 has 4 divisors (see below), whose sum is σ = 63989760. Its totient is φ = 47992308.

The previous prime is 55991017. The next prime is 55991041. The reversal of 55991033 is 33019955.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33019955 = 5 ⋅6603991.

It is not a de Polignac number, because 55991033 - 2⁴ = 55991017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55990984 and 55991002.

It is not an unprimeable number, because it can be changed into a prime (55991003) 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, 3999353 + ... + 3999366.

It is an arithmetic number, because the mean of its divisors is an integer number (15997440).

Almost surely, 2^55991033 is an apocalyptic number.

It is an amenable number.

55991033 is a deficient number, since it is larger than the sum of its proper divisors (7998727).

55991033 is an equidigital number, since it uses as much as digits as its factorization.

55991033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7998726.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 55991033 is about 7482.7156166729. The cubic root of 55991033 is about 382.5658149241.

The spelling of 55991033 in words is "fifty-five million, nine hundred ninety-one thousand, thirty-three".