55999081 has 4 divisors (see below), whose sum is σ = 56063812. Its totient is φ = 55934352.

The previous prime is 55999079. The next prime is 55999121. The reversal of 55999081 is 18099955.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18099955 = 5 ⋅3619991.

It can be written as a sum of positive squares in 2 ways, for example, as 23040000 + 32959081 = 4800^2 + 5741^2 .

It is a cyclic number.

It is not a de Polignac number, because 55999081 - 2¹ = 55999079 is a prime.

It is a super-2 number, since 2×55999081² = 6271794145689122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55999381) 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, 31050 + ... + 32803.

It is an arithmetic number, because the mean of its divisors is an integer number (14015953).

Almost surely, 2^55999081 is an apocalyptic number.

It is an amenable number.

55999081 is a deficient number, since it is larger than the sum of its proper divisors (64731).

55999081 is an equidigital number, since it uses as much as digits as its factorization.

55999081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64730.

The product of its (nonzero) digits is 145800, while the sum is 46.

The square root of 55999081 is about 7483.2533700256. The cubic root of 55999081 is about 382.5841437052.

The spelling of 55999081 in words is "fifty-five million, nine hundred ninety-nine thousand, eighty-one".