1020510561 has 16 divisors (see below), whose sum is σ = 1646538624. Its totient is φ = 548845824.

The previous prime is 1020510553. The next prime is 1020510587. The reversal of 1020510561 is 1650150201.

1020510561 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 1020510561 - 2³ = 1020510553 is a prime.

It is a super-2 number, since 2×1020510561² = 2082883610225069442, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is not an unprimeable number, because it can be changed into a prime (1020510511) 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, 1428930 + ... + 1429643.

It is an arithmetic number, because the mean of its divisors is an integer number (102908664).

Almost surely, 2^1020510561 is an apocalyptic number.

It is an amenable number.

1020510561 is a deficient number, since it is larger than the sum of its proper divisors (626028063).

1020510561 is a wasteful number, since it uses less digits than its factorization.

1020510561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2858600.

The product of its (nonzero) digits is 300, while the sum is 21.

The square root of 1020510561 is about 31945.4309878580. The cubic root of 1020510561 is about 1006.7906365437.

Adding to 1020510561 its reverse (1650150201), we get a palindrome (2670660762).

The spelling of 1020510561 in words is "one billion, twenty million, five hundred ten thousand, five hundred sixty-one".