1853121089 has 4 divisors (see below), whose sum is σ = 1854464340. Its totient is φ = 1851777840.

The previous prime is 1853121071. The next prime is 1853121107. The reversal of 1853121089 is 9801213581.

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

It is an interprime number because it is at equal distance from previous prime (1853121071) and next prime (1853121107).

It can be written as a sum of positive squares in 2 ways, for example, as 292239025 + 1560882064 = 17095^2 + 39508^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1853121089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1853121019) 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, 669554 + ... + 672315.

It is an arithmetic number, because the mean of its divisors is an integer number (463616085).

Almost surely, 2^1853121089 is an apocalyptic number.

It is an amenable number.

1853121089 is a deficient number, since it is larger than the sum of its proper divisors (1343251).

1853121089 is a wasteful number, since it uses less digits than its factorization.

1853121089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1343250.

The product of its (nonzero) digits is 17280, while the sum is 38.

The square root of 1853121089 is about 43047.8929681814. The cubic root of 1853121089 is about 1228.2909900529.

The spelling of 1853121089 in words is "one billion, eight hundred fifty-three million, one hundred twenty-one thousand, eighty-nine".