1020045013 has 4 divisors (see below), whose sum is σ = 1098510028. Its totient is φ = 941580000.

The previous prime is 1020045007. The next prime is 1020045029. The reversal of 1020045013 is 3105400201.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3105400201 = 71 ⋅43738031.

It can be written as a sum of positive squares in 2 ways, for example, as 326091364 + 693953649 = 18058^2 + 26343^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020045013 - 2⁵ = 1020044981 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 (1020045073) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39232488 + ... + 39232513.

It is an arithmetic number, because the mean of its divisors is an integer number (274627507).

Almost surely, 2^1020045013 is an apocalyptic number.

1020045013 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1020045013 is a deficient number, since it is larger than the sum of its proper divisors (78465015).

1020045013 is an equidigital number, since it uses as much as digits as its factorization.

1020045013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78465014.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 1020045013 is about 31938.1435434184. The cubic root of 1020045013 is about 1006.6375168939.

Adding to 1020045013 its reverse (3105400201), we get a palindrome (4125445214).

The spelling of 1020045013 in words is "one billion, twenty million, forty-five thousand, thirteen".