498256691 has 4 divisors (see below), whose sum is σ = 501240432. Its totient is φ = 495272952.

The previous prime is 498256679. The next prime is 498256721. The reversal of 498256691 is 196652894.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 196652894 = 2 ⋅98326447.

It is a cyclic number.

It is not a de Polignac number, because 498256691 - 2¹⁸ = 497994547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (498256651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1491620 + ... + 1491953.

It is an arithmetic number, because the mean of its divisors is an integer number (125310108).

Almost surely, 2^498256691 is an apocalyptic number.

498256691 is a deficient number, since it is larger than the sum of its proper divisors (2983741).

498256691 is a wasteful number, since it uses less digits than its factorization.

498256691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2983740.

The product of its digits is 933120, while the sum is 50.

The square root of 498256691 is about 22321.6641628710. The cubic root of 498256691 is about 792.7770083198. Note that the first 3 decimals are identical.

The spelling of 498256691 in words is "four hundred ninety-eight million, two hundred fifty-six thousand, six hundred ninety-one".