1131305505 has 32 divisors (see below), whose sum is σ = 2078576640. Its totient is φ = 519641280.

The previous prime is 1131305501. The next prime is 1131305507. The reversal of 1131305505 is 5055031311.

It is not a de Polignac number, because 1131305505 - 2² = 1131305501 is a prime.

It is a super-3 number, since 3×1131305505³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131305501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177297 + ... + 183566.

It is an arithmetic number, because the mean of its divisors is an integer number (64955520).

Almost surely, 2^1131305505 is an apocalyptic number.

1131305505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1131305505 is a deficient number, since it is larger than the sum of its proper divisors (947271135).

1131305505 is a wasteful number, since it uses less digits than its factorization.

1131305505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360901.

The product of its (nonzero) digits is 1125, while the sum is 24.

The square root of 1131305505 is about 33634.8852383950. The cubic root of 1131305505 is about 1041.9814004758.

Adding to 1131305505 its reverse (5055031311), we get a palindrome (6186336816).

The spelling of 1131305505 in words is "one billion, one hundred thirty-one million, three hundred five thousand, five hundred five".