1121142805 has 4 divisors (see below), whose sum is σ = 1345371372. Its totient is φ = 896914240.

The previous prime is 1121142793. The next prime is 1121142811. The reversal of 1121142805 is 5082411211.

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 487261476 + 633881329 = 22074^2 + 25177^2 .

It is not a de Polignac number, because 1121142805 - 2⁷ = 1121142677 is a prime.

It is a super-2 number, since 2×1121142805² = 2513922378406536050, which contains 22 as substring.

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 1121142805.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112114276 + ... + 112114285.

It is an arithmetic number, because the mean of its divisors is an integer number (336342843).

Almost surely, 2^1121142805 is an apocalyptic number.

It is an amenable number.

1121142805 is a deficient number, since it is larger than the sum of its proper divisors (224228567).

1121142805 is an equidigital number, since it uses as much as digits as its factorization.

1121142805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224228566.

The product of its (nonzero) digits is 640, while the sum is 25.

The square root of 1121142805 is about 33483.4706235778. The cubic root of 1121142805 is about 1038.8519150778.

The spelling of 1121142805 in words is "one billion, one hundred twenty-one million, one hundred forty-two thousand, eight hundred five".