218057449 has 2 divisors, whose sum is σ = 218057450. Its totient is φ = 218057448.

The previous prime is 218057431. The next prime is 218057461. The reversal of 218057449 is 944750812.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 145926400 + 72131049 = 12080^2 + 8493^2 .

It is a cyclic number.

It is not a de Polignac number, because 218057449 - 2⁷ = 218057321 is a prime.

It is not a weakly prime, because it can be changed into another prime (218057479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109028724 + 109028725.

It is an arithmetic number, because the mean of its divisors is an integer number (109028725).

Almost surely, 2^218057449 is an apocalyptic number.

It is an amenable number.

218057449 is a deficient number, since it is larger than the sum of its proper divisors (1).

218057449 is an equidigital number, since it uses as much as digits as its factorization.

218057449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 80640, while the sum is 40.

The square root of 218057449 is about 14766.7684007030. The cubic root of 218057449 is about 601.8990285137.

The spelling of 218057449 in words is "two hundred eighteen million, fifty-seven thousand, four hundred forty-nine".