1613979613 has 4 divisors (see below), whose sum is σ = 1614816508. Its totient is φ = 1613142720.

The previous prime is 1613979607. The next prime is 1613979617. The reversal of 1613979613 is 3169793161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3169793161 = 19 ⋅166831219.

It can be written as a sum of positive squares in 2 ways, for example, as 897721444 + 716258169 = 29962^2 + 26763^2 .

It is a cyclic number.

It is not a de Polignac number, because 1613979613 - 2⁵ = 1613979581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613979617) 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, 415548 + ... + 419413.

It is an arithmetic number, because the mean of its divisors is an integer number (403704127).

Almost surely, 2^1613979613 is an apocalyptic number.

It is an amenable number.

1613979613 is a deficient number, since it is larger than the sum of its proper divisors (836895).

1613979613 is an equidigital number, since it uses as much as digits as its factorization.

1613979613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836894.

The product of its digits is 183708, while the sum is 46.

The square root of 1613979613 is about 40174.3651225505. The cubic root of 1613979613 is about 1173.0036087022.

The spelling of 1613979613 in words is "one billion, six hundred thirteen million, nine hundred seventy-nine thousand, six hundred thirteen".