499459981 has 4 divisors (see below), whose sum is σ = 500335264. Its totient is φ = 498584700.

The previous prime is 499459963. The next prime is 499460021. The reversal of 499459981 is 189954994.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 499459981 - 2⁷ = 499459853 is a prime.

It is a super-2 number, since 2×499459981² = 498920545241040722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (499459931) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 436785 + ... + 437926.

It is an arithmetic number, because the mean of its divisors is an integer number (125083816).

Almost surely, 2^499459981 is an apocalyptic number.

It is an amenable number.

499459981 is a deficient number, since it is larger than the sum of its proper divisors (875283).

499459981 is an equidigital number, since it uses as much as digits as its factorization.

499459981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875282.

The product of its digits is 4199040, while the sum is 58.

The square root of 499459981 is about 22348.6013208881. The cubic root of 499459981 is about 793.4146808086.

The spelling of 499459981 in words is "four hundred ninety-nine million, four hundred fifty-nine thousand, nine hundred eighty-one".