1613523 has 4 divisors (see below), whose sum is σ = 2151368. Its totient is φ = 1075680.

The previous prime is 1613509. The next prime is 1613539. The reversal of 1613523 is 3253161.

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

It is not a de Polignac number, because 1613523 - 2¹⁴ = 1597139 is a prime.

It is a D-number.

It is a Duffinian number.

1613523 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1613523.

It is not an unprimeable number, because it can be changed into a prime (1613503) 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, 268918 + ... + 268923.

It is an arithmetic number, because the mean of its divisors is an integer number (537842).

2^1613523 is an apocalyptic number.

1613523 is a deficient number, since it is larger than the sum of its proper divisors (537845).

1613523 is an equidigital number, since it uses as much as digits as its factorization.

1613523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537844.

The product of its digits is 540, while the sum is 21.

The square root of 1613523 is about 1270.2452519100. The cubic root of 1613523 is about 117.2892979627.

Adding to 1613523 its reverse (3253161), we get a palindrome (4866684).

The spelling of 1613523 in words is "one million, six hundred thirteen thousand, five hundred twenty-three".