1020015645 has 16 divisors (see below), whose sum is σ = 1780391232. Its totient is φ = 494552960.

The previous prime is 1020015643. The next prime is 1020015653. The reversal of 1020015645 is 5465100201.

1020015645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1020015645 - 2¹ = 1020015643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1020015643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3090792 + ... + 3091121.

It is an arithmetic number, because the mean of its divisors is an integer number (111274452).

Almost surely, 2^1020015645 is an apocalyptic number.

1020015645 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1020015645 is a deficient number, since it is larger than the sum of its proper divisors (760375587).

1020015645 is a wasteful number, since it uses less digits than its factorization.

1020015645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6181932.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 1020015645 is about 31937.6837763793. The cubic root of 1020015645 is about 1006.6278561391.

Adding to 1020015645 its reverse (5465100201), we get a palindrome (6485115846).

It can be divided in two parts, 10200156 and 45, that added together give a palindrome (10200201).

The spelling of 1020015645 in words is "one billion, twenty million, fifteen thousand, six hundred forty-five".