498256721 has 2 divisors, whose sum is σ = 498256722. Its totient is φ = 498256720.

The previous prime is 498256679. The next prime is 498256727. The reversal of 498256721 is 127652894.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 317730625 + 180526096 = 17825^2 + 13436^2 .

It is a cyclic number.

It is not a de Polignac number, because 498256721 - 2¹⁸ = 497994577 is a prime.

It is not a weakly prime, because it can be changed into another prime (498256727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249128360 + 249128361.

It is an arithmetic number, because the mean of its divisors is an integer number (249128361).

Almost surely, 2^498256721 is an apocalyptic number.

It is an amenable number.

498256721 is a deficient number, since it is larger than the sum of its proper divisors (1).

498256721 is an equidigital number, since it uses as much as digits as its factorization.

498256721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 498256721 is about 22321.6648348639. The cubic root of 498256721 is about 792.7770242308. Note that the first 3 decimals are identical.

The spelling of 498256721 in words is "four hundred ninety-eight million, two hundred fifty-six thousand, seven hundred twenty-one".