1121200109 has 4 divisors (see below), whose sum is σ = 1122212220. Its totient is φ = 1120188000.

The previous prime is 1121200081. The next prime is 1121200141. The reversal of 1121200109 is 9010021211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9010021211 = 43 ⋅209535377.

It can be written as a sum of positive squares in 2 ways, for example, as 303526084 + 817674025 = 17422^2 + 28595^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121200109 - 2⁸ = 1121199853 is a prime.

It is a super-2 number, since 2×1121200109² = 2514179368843223762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121200009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 504392 + ... + 506609.

It is an arithmetic number, because the mean of its divisors is an integer number (280553055).

Almost surely, 2^1121200109 is an apocalyptic number.

It is an amenable number.

1121200109 is a deficient number, since it is larger than the sum of its proper divisors (1012111).

1121200109 is a wasteful number, since it uses less digits than its factorization.

1121200109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1012110.

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1121200109 is about 33484.3263184434. The cubic root of 1121200109 is about 1038.8696140886.

The spelling of 1121200109 in words is "one billion, one hundred twenty-one million, two hundred thousand, one hundred nine".