1289921093 has 4 divisors (see below), whose sum is σ = 1300078080. Its totient is φ = 1279764108.

The previous prime is 1289921089. The next prime is 1289921123. The reversal of 1289921093 is 3901299821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1289921093 - 2² = 1289921089 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1289921033) 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, 5078303 + ... + 5078556.

It is an arithmetic number, because the mean of its divisors is an integer number (325019520).

Almost surely, 2^1289921093 is an apocalyptic number.

It is an amenable number.

1289921093 is a deficient number, since it is larger than the sum of its proper divisors (10156987).

1289921093 is a wasteful number, since it uses less digits than its factorization.

1289921093 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10156986.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 1289921093 is about 35915.4714990629. The cubic root of 1289921093 is about 1088.5650373536.

The spelling of 1289921093 in words is "one billion, two hundred eighty-nine million, nine hundred twenty-one thousand, ninety-three".