1131628779 has 8 divisors (see below), whose sum is σ = 1676487120. Its totient is φ = 754419168.

The previous prime is 1131628769. The next prime is 1131628781. The reversal of 1131628779 is 9778261311.

1131628779 is a `hidden beast` number, since 1 + 13 + 1 + 628 + 7 + 7 + 9 = 666.

It is not a de Polignac number, because 1131628779 - 2¹³ = 1131620587 is a prime.

It is a super-2 number, since 2×1131628779² = 2561167386922061682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1131628739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20956062 + ... + 20956115.

It is an arithmetic number, because the mean of its divisors is an integer number (209560890).

Almost surely, 2^1131628779 is an apocalyptic number.

1131628779 is a deficient number, since it is larger than the sum of its proper divisors (544858341).

1131628779 is an equidigital number, since it uses as much as digits as its factorization.

1131628779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41912186 (or 41912180 counting only the distinct ones).

The product of its digits is 127008, while the sum is 45.

The square root of 1131628779 is about 33639.6905306812. The cubic root of 1131628779 is about 1042.0806408118.

The spelling of 1131628779 in words is "one billion, one hundred thirty-one million, six hundred twenty-eight thousand, seven hundred seventy-nine".