497780821 has 2 divisors, whose sum is σ = 497780822. Its totient is φ = 497780820.

The previous prime is 497780813. The next prime is 497780831. The reversal of 497780821 is 128087794.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 497780721 + 100 = 22311^2 + 10^2 .

It is a cyclic number.

It is not a de Polignac number, because 497780821 - 2³ = 497780813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (497780831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248890410 + 248890411.

It is an arithmetic number, because the mean of its divisors is an integer number (248890411).

Almost surely, 2^497780821 is an apocalyptic number.

It is an amenable number.

497780821 is a deficient number, since it is larger than the sum of its proper divisors (1).

497780821 is an equidigital number, since it uses as much as digits as its factorization.

497780821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 497780821 is about 22311.0022410469. The cubic root of 497780821 is about 792.5245420921.

The spelling of 497780821 in words is "four hundred ninety-seven million, seven hundred eighty thousand, eight hundred twenty-one".