1131656689 has 8 divisors (see below), whose sum is σ = 1171913832. Its totient is φ = 1092099840.

The previous prime is 1131656657. The next prime is 1131656759. The reversal of 1131656689 is 9866561311.

It can be written as a sum of positive squares in 4 ways, for example, as 49773025 + 1081883664 = 7055^2 + 32892^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131656689 - 2⁵ = 1131656657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131656789) 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, 171784 + ... + 178249.

It is an arithmetic number, because the mean of its divisors is an integer number (146489229).

Almost surely, 2^1131656689 is an apocalyptic number.

It is an amenable number.

1131656689 is a deficient number, since it is larger than the sum of its proper divisors (40257143).

1131656689 is an equidigital number, since it uses as much as digits as its factorization.

1131656689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 350147.

The product of its digits is 233280, while the sum is 46.

The square root of 1131656689 is about 33640.1053654711. The cubic root of 1131656689 is about 1042.0892078826.

The spelling of 1131656689 in words is "one billion, one hundred thirty-one million, six hundred fifty-six thousand, six hundred eighty-nine".