1126505861 has 4 divisors (see below), whose sum is σ = 1213160172. Its totient is φ = 1039851552.

The previous prime is 1126505843. The next prime is 1126505881. The reversal of 1126505861 is 1685056211.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 659513761 + 466992100 = 25681^2 + 21610^2 .

It is a cyclic number.

It is not a de Polignac number, because 1126505861 - 2¹⁰ = 1126504837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1126505881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43327136 + ... + 43327161.

It is an arithmetic number, because the mean of its divisors is an integer number (303290043).

Almost surely, 2^1126505861 is an apocalyptic number.

It is an amenable number.

1126505861 is a deficient number, since it is larger than the sum of its proper divisors (86654311).

1126505861 is an equidigital number, since it uses as much as digits as its factorization.

1126505861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86654310.

The product of its (nonzero) digits is 14400, while the sum is 35.

The square root of 1126505861 is about 33563.4602060038. The cubic root of 1126505861 is about 1040.5057516095.

The spelling of 1126505861 in words is "one billion, one hundred twenty-six million, five hundred five thousand, eight hundred sixty-one".