1131505515 has 24 divisors (see below), whose sum is σ = 2241459168. Its totient is φ = 517259520.

The previous prime is 1131505511. The next prime is 1131505517. The reversal of 1131505515 is 5155051311.

It is not a de Polignac number, because 1131505515 - 2² = 1131505511 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1131505511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1795726 + ... + 1796355.

It is an arithmetic number, because the mean of its divisors is an integer number (93394132).

Almost surely, 2^1131505515 is an apocalyptic number.

1131505515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1131505515 is a deficient number, since it is larger than the sum of its proper divisors (1109953653).

1131505515 is a wasteful number, since it uses less digits than its factorization.

1131505515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3592099 (or 3592096 counting only the distinct ones).

The product of its (nonzero) digits is 1875, while the sum is 27.

The square root of 1131505515 is about 33637.8583592951. The cubic root of 1131505515 is about 1042.0428028168.

Adding to 1131505515 its reverse (5155051311), we get a palindrome (6286556826).

The spelling of 1131505515 in words is "one billion, one hundred thirty-one million, five hundred five thousand, five hundred fifteen".