55218497 has 2 divisors, whose sum is σ = 55218498. Its totient is φ = 55218496.

The previous prime is 55218491. The next prime is 55218517. The reversal of 55218497 is 79481255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33166081 + 22052416 = 5759^2 + 4696^2 .

It is a cyclic number.

It is not a de Polignac number, because 55218497 - 2⁶ = 55218433 is a prime.

It is not a weakly prime, because it can be changed into another prime (55218491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27609248 + 27609249.

It is an arithmetic number, because the mean of its divisors is an integer number (27609249).

Almost surely, 2^55218497 is an apocalyptic number.

It is an amenable number.

55218497 is a deficient number, since it is larger than the sum of its proper divisors (1).

55218497 is an equidigital number, since it uses as much as digits as its factorization.

55218497 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 41.

The square root of 55218497 is about 7430.9149503947. The cubic root of 55218497 is about 380.7981768539.

The spelling of 55218497 in words is "fifty-five million, two hundred eighteen thousand, four hundred ninety-seven".