498995621 has 2 divisors, whose sum is σ = 498995622. Its totient is φ = 498995620.

The previous prime is 498995591. The next prime is 498995633. The reversal of 498995621 is 126599894.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 359519521 + 139476100 = 18961^2 + 11810^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-498995621 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (498995821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249497810 + 249497811.

It is an arithmetic number, because the mean of its divisors is an integer number (249497811).

Almost surely, 2^498995621 is an apocalyptic number.

It is an amenable number.

498995621 is a deficient number, since it is larger than the sum of its proper divisors (1).

498995621 is an equidigital number, since it uses as much as digits as its factorization.

498995621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1399680, while the sum is 53.

The square root of 498995621 is about 22338.2098879924. The cubic root of 498995621 is about 793.1687189741.

The spelling of 498995621 in words is "four hundred ninety-eight million, nine hundred ninety-five thousand, six hundred twenty-one".