613904081 has 4 divisors (see below), whose sum is σ = 701604672. Its totient is φ = 526203492.

The previous prime is 613904033. The next prime is 613904087. The reversal of 613904081 is 180409316.

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 a cyclic number.

It is not a de Polignac number, because 613904081 - 2¹⁸ = 613641937 is a prime.

It is a super-2 number, since 2×613904081² = 753756441336909122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (613904087) 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, 43850285 + ... + 43850298.

It is an arithmetic number, because the mean of its divisors is an integer number (175401168).

Almost surely, 2^613904081 is an apocalyptic number.

It is an amenable number.

613904081 is a deficient number, since it is larger than the sum of its proper divisors (87700591).

613904081 is an equidigital number, since it uses as much as digits as its factorization.

613904081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87700590.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 613904081 is about 24777.0878232289. The cubic root of 613904081 is about 849.8980643619.

The spelling of 613904081 in words is "six hundred thirteen million, nine hundred four thousand, eighty-one".