613742321 has 4 divisors (see below), whose sum is σ = 614011812. Its totient is φ = 613472832.

The previous prime is 613742303. The next prime is 613742333. The reversal of 613742321 is 123247316.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 86397025 + 527345296 = 9295^2 + 22964^2 .

It is a cyclic number.

It is not a de Polignac number, because 613742321 - 2⁶ = 613742257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613742021) 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, 131300 + ... + 135893.

It is an arithmetic number, because the mean of its divisors is an integer number (153502953).

Almost surely, 2^613742321 is an apocalyptic number.

It is an amenable number.

613742321 is a deficient number, since it is larger than the sum of its proper divisors (269491).

613742321 is a wasteful number, since it uses less digits than its factorization.

613742321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269490.

The product of its digits is 6048, while the sum is 29.

The square root of 613742321 is about 24773.8233020259. The cubic root of 613742321 is about 849.8234101437.

Adding to 613742321 its reverse (123247316), we get a palindrome (736989637).

The spelling of 613742321 in words is "six hundred thirteen million, seven hundred forty-two thousand, three hundred twenty-one".