1020565613 has 4 divisors (see below), whose sum is σ = 1020741408. Its totient is φ = 1020389820.

The previous prime is 1020565577. The next prime is 1020565633. The reversal of 1020565613 is 3165650201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 3165650201 = 7 ⋅452235743.

It is a cyclic number.

It is not a de Polignac number, because 1020565613 - 2⁶ = 1020565549 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 (1020565633) 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, 78881 + ... + 90902.

It is an arithmetic number, because the mean of its divisors is an integer number (255185352).

Almost surely, 2^1020565613 is an apocalyptic number.

It is an amenable number.

1020565613 is a deficient number, since it is larger than the sum of its proper divisors (175795).

1020565613 is an equidigital number, since it uses as much as digits as its factorization.

1020565613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175794.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 1020565613 is about 31946.2926331053. The cubic root of 1020565613 is about 1006.8087401752.

The spelling of 1020565613 in words is "one billion, twenty million, five hundred sixty-five thousand, six hundred thirteen".