548215397 has 2 divisors, whose sum is σ = 548215398. Its totient is φ = 548215396.

The previous prime is 548215363. The next prime is 548215429. The reversal of 548215397 is 793512845.

It is a Cunningham number, because it is equal to 23414²+1.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 548215396 + 1 = 23414^2 + 1^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-548215397 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (548215307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 274107698 + 274107699.

It is an arithmetic number, because the mean of its divisors is an integer number (274107699).

Almost surely, 2^548215397 is an apocalyptic number.

It is an amenable number.

548215397 is a deficient number, since it is larger than the sum of its proper divisors (1).

548215397 is an equidigital number, since it uses as much as digits as its factorization.

548215397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 44.

The square root of 548215397 is about 23414.0000213547. Note that the first 4 decimals coincide. The cubic root of 548215397 is about 818.4341509053.

The spelling of 548215397 in words is "five hundred forty-eight million, two hundred fifteen thousand, three hundred ninety-seven".