219490457 has 2 divisors, whose sum is σ = 219490458. Its totient is φ = 219490456.

The previous prime is 219490441. The next prime is 219490477. The reversal of 219490457 is 754094912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 173738761 + 45751696 = 13181^2 + 6764^2 .

It is a cyclic number.

It is not a de Polignac number, because 219490457 - 2⁴ = 219490441 is a prime.

It is not a weakly prime, because it can be changed into another prime (219490477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109745228 + 109745229.

It is an arithmetic number, because the mean of its divisors is an integer number (109745229).

Almost surely, 2^219490457 is an apocalyptic number.

It is an amenable number.

219490457 is a deficient number, since it is larger than the sum of its proper divisors (1).

219490457 is an equidigital number, since it uses as much as digits as its factorization.

219490457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90720, while the sum is 41.

The square root of 219490457 is about 14815.2103258779. The cubic root of 219490457 is about 603.2146505731.

The spelling of 219490457 in words is "two hundred nineteen million, four hundred ninety thousand, four hundred fifty-seven".