1126990261 has 4 divisors (see below), whose sum is σ = 1127692300. Its totient is φ = 1126288224.

The previous prime is 1126990243. The next prime is 1126990273. The reversal of 1126990261 is 1620996211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1620996211 = 7703 ⋅210437.

It can be written as a sum of positive squares in 2 ways, for example, as 514427761 + 612562500 = 22681^2 + 24750^2 .

It is a cyclic number.

It is not a de Polignac number, because 1126990261 - 2²¹ = 1124893109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1126990261.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1126994261) 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, 348606 + ... + 351823.

It is an arithmetic number, because the mean of its divisors is an integer number (281923075).

Almost surely, 2^1126990261 is an apocalyptic number.

It is an amenable number.

1126990261 is a deficient number, since it is larger than the sum of its proper divisors (702039).

1126990261 is an equidigital number, since it uses as much as digits as its factorization.

1126990261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 702038.

The product of its (nonzero) digits is 11664, while the sum is 37.

The square root of 1126990261 is about 33570.6756113129. The cubic root of 1126990261 is about 1040.6548701590.

It can be divided in two parts, 1126990 and 261, that added together give a triangular number (1127251 = T₁₅₀₁).

The spelling of 1126990261 in words is "one billion, one hundred twenty-six million, nine hundred ninety thousand, two hundred sixty-one".