490842421 has 2 divisors, whose sum is σ = 490842422. Its totient is φ = 490842420.

The previous prime is 490842413. The next prime is 490842467. The reversal of 490842421 is 124248094.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 460746225 + 30096196 = 21465^2 + 5486^2 .

It is a cyclic number.

It is not a de Polignac number, because 490842421 - 2³ = 490842413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (490849421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 245421210 + 245421211.

It is an arithmetic number, because the mean of its divisors is an integer number (245421211).

Almost surely, 2^490842421 is an apocalyptic number.

It is an amenable number.

490842421 is a deficient number, since it is larger than the sum of its proper divisors (1).

490842421 is an equidigital number, since it uses as much as digits as its factorization.

490842421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 490842421 is about 22154.9638004669. The cubic root of 490842421 is about 788.8250551985.

The spelling of 490842421 in words is "four hundred ninety million, eight hundred forty-two thousand, four hundred twenty-one".