1131520505 has 4 divisors (see below), whose sum is σ = 1357824612. Its totient is φ = 905216400.

The previous prime is 1131520393. The next prime is 1131520517. The reversal of 1131520505 is 5050251311.

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 774008041 + 357512464 = 27821^2 + 18908^2 .

It is not a de Polignac number, because 1131520505 - 2¹⁶ = 1131454969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113152046 + ... + 113152055.

It is an arithmetic number, because the mean of its divisors is an integer number (339456153).

Almost surely, 2^1131520505 is an apocalyptic number.

It is an amenable number.

1131520505 is a deficient number, since it is larger than the sum of its proper divisors (226304107).

1131520505 is an equidigital number, since it uses as much as digits as its factorization.

1131520505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226304106.

The product of its (nonzero) digits is 750, while the sum is 23.

The square root of 1131520505 is about 33638.0811729801. The cubic root of 1131520505 is about 1042.0474044007.

Adding to 1131520505 its reverse (5050251311), we get a palindrome (6181771816).

The spelling of 1131520505 in words is "one billion, one hundred thirty-one million, five hundred twenty thousand, five hundred five".