1021145525 has 6 divisors (see below), whose sum is σ = 1266220482. Its totient is φ = 816916400.

The previous prime is 1021145507. The next prime is 1021145537. The reversal of 1021145525 is 5255411201.

It can be written as a sum of positive squares in 3 ways, for example, as 5958481 + 1015187044 = 2441^2 + 31862^2 .

It is not a de Polignac number, because 1021145525 - 2⁸ = 1021145269 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1021145494 and 1021145503.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20422886 + ... + 20422935.

It is an arithmetic number, because the mean of its divisors is an integer number (211036747).

Almost surely, 2^1021145525 is an apocalyptic number.

It is an amenable number.

1021145525 is a deficient number, since it is larger than the sum of its proper divisors (245074957).

1021145525 is an equidigital number, since it uses as much as digits as its factorization.

1021145525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40845831 (or 40845826 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 1021145525 is about 31955.3677024690. The cubic root of 1021145525 is about 1006.9994023954. Note that the first 3 decimals are identical.

Adding to 1021145525 its reverse (5255411201), we get a palindrome (6276556726).

The spelling of 1021145525 in words is "one billion, twenty-one million, one hundred forty-five thousand, five hundred twenty-five".