1020531531 has 4 divisors (see below), whose sum is σ = 1360708712. Its totient is φ = 680354352.

The previous prime is 1020531517. The next prime is 1020531541. The reversal of 1020531531 is 1351350201.

1020531531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 1020531531 - 2⁹ = 1020531019 is a prime.

It is a super-2 number, since 2×1020531531² = 2082969211530407922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1020531498 and 1020531507.

It is not an unprimeable number, because it can be changed into a prime (1020531541) 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, 170088586 + ... + 170088591.

It is an arithmetic number, because the mean of its divisors is an integer number (340177178).

Almost surely, 2^1020531531 is an apocalyptic number.

1020531531 is a deficient number, since it is larger than the sum of its proper divisors (340177181).

1020531531 is an equidigital number, since it uses as much as digits as its factorization.

1020531531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340177180.

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 1020531531 is about 31945.7592021226. The cubic root of 1020531531 is about 1006.7975325217.

Adding to 1020531531 its reverse (1351350201), we get a palindrome (2371881732).

The spelling of 1020531531 in words is "one billion, twenty million, five hundred thirty-one thousand, five hundred thirty-one".