1131065613 has 12 divisors (see below), whose sum is σ = 1694271488. Its totient is φ = 754043580.

The previous prime is 1131065609. The next prime is 1131065629. The reversal of 1131065613 is 3165601311.

1131065613 is a `hidden beast` number, since 1 + 1 + 3 + 1 + 0 + 656 + 1 + 3 = 666.

It is not a de Polignac number, because 1131065613 - 2² = 1131065609 is a prime.

It is a super-2 number, since 2×1131065613² = 2558618841822131538, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131065693) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2327053 + ... + 2327538.

Almost surely, 2^1131065613 is an apocalyptic number.

It is an amenable number.

1131065613 is a deficient number, since it is larger than the sum of its proper divisors (563205875).

1131065613 is an frugal number, since it uses more digits than its factorization.

1131065613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4654606 (or 4654594 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 27.

The square root of 1131065613 is about 33631.3189304256. The cubic root of 1131065613 is about 1041.9077449597.

Adding to 1131065613 its reverse (3165601311), we get a palindrome (4296666924).

The spelling of 1131065613 in words is "one billion, one hundred thirty-one million, sixty-five thousand, six hundred thirteen".