55518493 has 2 divisors, whose sum is σ = 55518494. Its totient is φ = 55518492.

The previous prime is 55518473. The next prime is 55518509. The reversal of 55518493 is 39481555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53319204 + 2199289 = 7302^2 + 1483^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55518493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55518433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27759246 + 27759247.

It is an arithmetic number, because the mean of its divisors is an integer number (27759247).

Almost surely, 2^55518493 is an apocalyptic number.

It is an amenable number.

55518493 is a deficient number, since it is larger than the sum of its proper divisors (1).

55518493 is an equidigital number, since it uses as much as digits as its factorization.

55518493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 108000, while the sum is 40.

The square root of 55518493 is about 7451.0732783942. The cubic root of 55518493 is about 381.4865432380.

The spelling of 55518493 in words is "fifty-five million, five hundred eighteen thousand, four hundred ninety-three".