55418081 has 2 divisors, whose sum is σ = 55418082. Its totient is φ = 55418080.

The previous prime is 55418071. The next prime is 55418087. The reversal of 55418081 is 18081455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44422225 + 10995856 = 6665^2 + 3316^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55418081 is a prime.

It is a super-2 number, since 2×55418081² = 6142327403445122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55418087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27709040 + 27709041.

It is an arithmetic number, because the mean of its divisors is an integer number (27709041).

Almost surely, 2^55418081 is an apocalyptic number.

It is an amenable number.

55418081 is a deficient number, since it is larger than the sum of its proper divisors (1).

55418081 is an equidigital number, since it uses as much as digits as its factorization.

55418081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6400, while the sum is 32.

The square root of 55418081 is about 7444.3321392856. The cubic root of 55418081 is about 381.2564160526.

The spelling of 55418081 in words is "fifty-five million, four hundred eighteen thousand, eighty-one".