1089256921 has 2 divisors, whose sum is σ = 1089256922. Its totient is φ = 1089256920.

The previous prime is 1089256867. The next prime is 1089256939. The reversal of 1089256921 is 1296529801.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1058786521 + 30470400 = 32539^2 + 5520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1089256921 is a prime.

It is not a weakly prime, because it can be changed into another prime (1089256981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 544628460 + 544628461.

It is an arithmetic number, because the mean of its divisors is an integer number (544628461).

Almost surely, 2^1089256921 is an apocalyptic number.

It is an amenable number.

1089256921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1089256921 is an equidigital number, since it uses as much as digits as its factorization.

1089256921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1089256921 is about 33003.8925128537. The cubic root of 1089256921 is about 1028.9085497520.

The spelling of 1089256921 in words is "one billion, eighty-nine million, two hundred fifty-six thousand, nine hundred twenty-one".