491615 has 4 divisors (see below), whose sum is σ = 589944. Its totient is φ = 393288.

The previous prime is 491611. The next prime is 491627. The reversal of 491615 is 516194.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 491615 - 2² = 491611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (491611) 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, 49157 + ... + 49166.

It is an arithmetic number, because the mean of its divisors is an integer number (147486).

2⁴⁹¹⁶¹⁵ is an apocalyptic number.

491615 is a deficient number, since it is larger than the sum of its proper divisors (98329).

491615 is an equidigital number, since it uses as much as digits as its factorization.

491615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98328.

The product of its digits is 1080, while the sum is 26.

The square root of 491615 is about 701.1526224725. The cubic root of 491615 is about 78.9238704726.

It can be divided in two parts, 4 and 91615, that added together give a palindrome (91619).

The spelling of 491615 in words is "four hundred ninety-one thousand, six hundred fifteen".