55909081 has 2 divisors, whose sum is σ = 55909082. Its totient is φ = 55909080.

The previous prime is 55909057. The next prime is 55909093. The reversal of 55909081 is 18090955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54997056 + 912025 = 7416^2 + 955^2 .

It is a cyclic number.

It is not a de Polignac number, because 55909081 - 2²⁵ = 22354649 is a prime.

It is a super-2 number, since 2×55909081² = 6251650676529122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55909081.

It is not a weakly prime, because it can be changed into another prime (55909781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27954540 + 27954541.

It is an arithmetic number, because the mean of its divisors is an integer number (27954541).

Almost surely, 2^55909081 is an apocalyptic number.

It is an amenable number.

55909081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55909081 is an equidigital number, since it uses as much as digits as its factorization.

55909081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 55909081 is about 7477.2375246477. The cubic root of 55909081 is about 382.3790746509.

The spelling of 55909081 in words is "fifty-five million, nine hundred nine thousand, eighty-one".