55009081 has 4 divisors (see below), whose sum is σ = 55092964. Its totient is φ = 54925200.

The previous prime is 55009069. The next prime is 55009091. The reversal of 55009081 is 18090055.

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 35295481 + 19713600 = 5941^2 + 4440^2 .

It is a cyclic number.

It is not a de Polignac number, because 55009081 - 2⁷ = 55008953 is a prime.

It is a super-2 number, since 2×55009081² = 6051997984929122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55009061) 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, 40950 + ... + 42271.

It is an arithmetic number, because the mean of its divisors is an integer number (13773241).

Almost surely, 2^55009081 is an apocalyptic number.

It is an amenable number.

55009081 is a deficient number, since it is larger than the sum of its proper divisors (83883).

55009081 is an equidigital number, since it uses as much as digits as its factorization.

55009081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83882.

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 55009081 is about 7416.8107027212. The cubic root of 55009081 is about 380.3161749918.

The spelling of 55009081 in words is "fifty-five million, nine thousand, eighty-one".