1020571121 has 4 divisors (see below), whose sum is σ = 1027071732. Its totient is φ = 1014070512.

The previous prime is 1020571087. The next prime is 1020571141. The reversal of 1020571121 is 1211750201.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 137827600 + 882743521 = 11740^2 + 29711^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020571121 - 2¹⁴ = 1020554737 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020571093 and 1020571102.

It is not an unprimeable number, because it can be changed into a prime (1020571141) 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, 3250070 + ... + 3250383.

It is an arithmetic number, because the mean of its divisors is an integer number (256767933).

Almost surely, 2^1020571121 is an apocalyptic number.

It is an amenable number.

1020571121 is a deficient number, since it is larger than the sum of its proper divisors (6500611).

1020571121 is an equidigital number, since it uses as much as digits as its factorization.

1020571121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6500610.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 1020571121 is about 31946.3788401753. The cubic root of 1020571121 is about 1006.8105514233.

The spelling of 1020571121 in words is "one billion, twenty million, five hundred seventy-one thousand, one hundred twenty-one".