491513 has 4 divisors (see below), whose sum is σ = 536208. Its totient is φ = 446820.

The previous prime is 491503. The next prime is 491527. The reversal of 491513 is 315194.

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 not a de Polignac number, because 491513 - 2⁴ = 491497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (491503) 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, 22331 + ... + 22352.

It is an arithmetic number, because the mean of its divisors is an integer number (134052).

2⁴⁹¹⁵¹³ is an apocalyptic number.

It is an amenable number.

491513 is a deficient number, since it is larger than the sum of its proper divisors (44695).

491513 is a wasteful number, since it uses less digits than its factorization.

491513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44694.

The product of its digits is 540, while the sum is 23.

The square root of 491513 is about 701.0798813259. The cubic root of 491513 is about 78.9184117352.

Adding to 491513 its sum of digits (23), we get a triangular number (491536 = T₉₉₁).

The spelling of 491513 in words is "four hundred ninety-one thousand, five hundred thirteen".