521790457 has 2 divisors, whose sum is σ = 521790458. Its totient is φ = 521790456.

The previous prime is 521790427. The next prime is 521790463. The reversal of 521790457 is 754097125.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 441168016 + 80622441 = 21004^2 + 8979^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-521790457 is a prime.

It is not a weakly prime, because it can be changed into another prime (521790427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260895228 + 260895229.

It is an arithmetic number, because the mean of its divisors is an integer number (260895229).

Almost surely, 2^521790457 is an apocalyptic number.

It is an amenable number.

521790457 is a deficient number, since it is larger than the sum of its proper divisors (1).

521790457 is an equidigital number, since it uses as much as digits as its factorization.

521790457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 88200, while the sum is 40.

The square root of 521790457 is about 22842.7331333184. The cubic root of 521790457 is about 805.0670350410.

The spelling of 521790457 in words is "five hundred twenty-one million, seven hundred ninety thousand, four hundred fifty-seven".