1131020505 has 24 divisors (see below), whose sum is σ = 2063617920. Its totient is φ = 571462560.

The previous prime is 1131020497. The next prime is 1131020507. The reversal of 1131020505 is 5050201311.

It is not a de Polignac number, because 1131020505 - 2³ = 1131020497 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1131020507) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 660561 + ... + 662270.

It is an arithmetic number, because the mean of its divisors is an integer number (85984080).

Almost surely, 2^1131020505 is an apocalyptic number.

1131020505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131020505 is a deficient number, since it is larger than the sum of its proper divisors (932597415).

1131020505 is a wasteful number, since it uses less digits than its factorization.

1131020505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1322861 (or 1322858 counting only the distinct ones).

The product of its (nonzero) digits is 150, while the sum is 18.

The square root of 1131020505 is about 33630.6482988360. The cubic root of 1131020505 is about 1041.8938940099.

Adding to 1131020505 its reverse (5050201311), we get a palindrome (6181221816).

The spelling of 1131020505 in words is "one billion, one hundred thirty-one million, twenty thousand, five hundred five".