1020531131 has 4 divisors (see below), whose sum is σ = 1080562392. Its totient is φ = 960499872.

The previous prime is 1020531121. The next prime is 1020531181. The reversal of 1020531131 is 1311350201.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020531131 is a prime.

It is a super-2 number, since 2×1020531131² = 2082967578680278322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 60031243 = 1020531131 / (1 + 0 + 2 + 0 + 5 + 3 + 1 + 1 + 3 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020531121) 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, 30015605 + ... + 30015638.

It is an arithmetic number, because the mean of its divisors is an integer number (270140598).

Almost surely, 2^1020531131 is an apocalyptic number.

1020531131 is a deficient number, since it is larger than the sum of its proper divisors (60031261).

1020531131 is an equidigital number, since it uses as much as digits as its factorization.

1020531131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60031260.

The product of its (nonzero) digits is 90, while the sum is 17.

The square root of 1020531131 is about 31945.7529415101. The cubic root of 1020531131 is about 1006.7974009827.

Adding to 1020531131 its reverse (1311350201), we get a palindrome (2331881332).

The spelling of 1020531131 in words is "one billion, twenty million, five hundred thirty-one thousand, one hundred thirty-one".