613499321 has 4 divisors (see below), whose sum is σ = 634654500. Its totient is φ = 592344144.

The previous prime is 613499317. The next prime is 613499333. The reversal of 613499321 is 123994316.

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 394459321 + 219040000 = 19861^2 + 14800^2 .

It is a cyclic number.

It is not a de Polignac number, because 613499321 - 2² = 613499317 is a prime.

It is a super-2 number, since 2×613499321² = 752762833734922082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (613499371) 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, 10577546 + ... + 10577603.

It is an arithmetic number, because the mean of its divisors is an integer number (158663625).

Almost surely, 2^613499321 is an apocalyptic number.

It is an amenable number.

613499321 is a deficient number, since it is larger than the sum of its proper divisors (21155179).

613499321 is a wasteful number, since it uses less digits than its factorization.

613499321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21155178.

The product of its digits is 34992, while the sum is 38.

The square root of 613499321 is about 24768.9184463109. The cubic root of 613499321 is about 849.7112380144.

The spelling of 613499321 in words is "six hundred thirteen million, four hundred ninety-nine thousand, three hundred twenty-one".