1261130689 has 24 divisors (see below), whose sum is σ = 1582848960. Its totient is φ = 995942304.

The previous prime is 1261130683. The next prime is 1261130797. The reversal of 1261130689 is 9860311621.

It is not a de Polignac number, because 1261130689 - 2⁵ = 1261130657 is a prime.

It is a super-2 number, since 2×1261130689² = 3180901229475229442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1261130683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 408052 + ... + 411130.

It is an arithmetic number, because the mean of its divisors is an integer number (65952040).

Almost surely, 2^1261130689 is an apocalyptic number.

It is an amenable number.

1261130689 is a deficient number, since it is larger than the sum of its proper divisors (321718271).

1261130689 is a wasteful number, since it uses less digits than its factorization.

1261130689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3749 (or 3742 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1261130689 is about 35512.4019041236. The cubic root of 1261130689 is about 1080.4052802802.

The spelling of 1261130689 in words is "one billion, two hundred sixty-one million, one hundred thirty thousand, six hundred eighty-nine".