498609981 has 24 divisors (see below), whose sum is σ = 738840960. Its totient is φ = 323873856.

The previous prime is 498609977. The next prime is 498609997. The reversal of 498609981 is 189906894.

498609981 is a `hidden beast` number, since 498 + 60 + 9 + 98 + 1 = 666.

It is not a de Polignac number, because 498609981 - 2² = 498609977 is a prime.

It is a super-2 number, since 2×498609981² = 497223826305640722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (498609971) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96030 + ... + 101088.

It is an arithmetic number, because the mean of its divisors is an integer number (30785040).

Almost surely, 2^498609981 is an apocalyptic number.

It is an amenable number.

498609981 is a deficient number, since it is larger than the sum of its proper divisors (240230979).

498609981 is a wasteful number, since it uses less digits than its factorization.

498609981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5345 (or 5342 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 498609981 is about 22329.5763730528. The cubic root of 498609981 is about 792.9643374771.

The spelling of 498609981 in words is "four hundred ninety-eight million, six hundred nine thousand, nine hundred eighty-one".