499891 has 4 divisors (see below), whose sum is σ = 571312. Its totient is φ = 428472.

The previous prime is 499883. The next prime is 499897. The reversal of 499891 is 198994.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 198994 = 2 ⋅99497.

It is a cyclic number.

It is not a de Polignac number, because 499891 - 2³ = 499883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (499897) 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, 35700 + ... + 35713.

It is an arithmetic number, because the mean of its divisors is an integer number (142828).

2⁴⁹⁹⁸⁹¹ is an apocalyptic number.

499891 is a deficient number, since it is larger than the sum of its proper divisors (71421).

499891 is an equidigital number, since it uses as much as digits as its factorization.

499891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71420.

The product of its digits is 23328, while the sum is 40.

The square root of 499891 is about 707.0297023464. The cubic root of 499891 is about 79.3642846221.

The spelling of 499891 in words is "four hundred ninety-nine thousand, eight hundred ninety-one".