613749 has 4 divisors (see below), whose sum is σ = 818336. Its totient is φ = 409164.

The previous prime is 613747. The next prime is 613759. The reversal of 613749 is 947316.

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 613749 - 2¹ = 613747 is a prime.

It is a D-number.

It is a Duffinian number.

613749 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (613741) 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, 102289 + ... + 102294.

It is an arithmetic number, because the mean of its divisors is an integer number (204584).

2⁶¹³⁷⁴⁹ is an apocalyptic number.

It is an amenable number.

613749 is a deficient number, since it is larger than the sum of its proper divisors (204587).

613749 is a wasteful number, since it uses less digits than its factorization.

613749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204586.

The product of its digits is 4536, while the sum is 30.

The square root of 613749 is about 783.4213425737. The cubic root of 613749 is about 84.9826492843.

The spelling of 613749 in words is "six hundred thirteen thousand, seven hundred forty-nine".