1121243201 has 4 divisors (see below), whose sum is σ = 1207492692. Its totient is φ = 1034993712.

The previous prime is 1121243173. The next prime is 1121243231. The reversal of 1121243201 is 1023421211.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1023421211 = 349 ⋅2932439.

It can be written as a sum of positive squares in 2 ways, for example, as 147865600 + 973377601 = 12160^2 + 31199^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1121243201 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 1121243201.

It is not an unprimeable number, because it can be changed into a prime (1121243231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43124726 + ... + 43124751.

It is an arithmetic number, because the mean of its divisors is an integer number (301873173).

Almost surely, 2^1121243201 is an apocalyptic number.

It is an amenable number.

1121243201 is a deficient number, since it is larger than the sum of its proper divisors (86249491).

1121243201 is an equidigital number, since it uses as much as digits as its factorization.

1121243201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86249490.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1121243201 is about 33484.9697774987. The cubic root of 1121243201 is about 1038.8829231597.

Adding to 1121243201 its reverse (1023421211), we get a palindrome (2144664412).

The spelling of 1121243201 in words is "one billion, one hundred twenty-one million, two hundred forty-three thousand, two hundred one".